app.branding.iconLogo has no effect when running the downstream image

[gashcrumb]

Describe the bug

When a user attempts to customize the favicon using app.branding.iconLogo the setting is ignored and only the Red Hat logo is shown for the tab icon. However app.title does take effect. This works as expected when running backstage-showcase locally in development mode.

Expected Behavior

The user configured favorite icon is shown instead of the default Red Hat logo

What are the steps to reproduce this bug?

1. Deploy RHDH using helm and set it up with a custom app config ConfigMap
2. Update the branding settings to:

data: 
  app-config-rhdh.yaml: |
    app: 
      branding: 
        iconLogo: data:image/png;base64,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

3. save the ConfigMap and delete the RHDH pod
4. The app should use the following favicon:

Versions of software used and environment

OCP 4.14.1
RHDH image version: 1.0-155

[gashcrumb]

Is this normally a build-time substitution that's done?

[invincibleJai]

Every browser pick favicon differently,

we are having developer hub icon as favicon by default and dynamically updating it based on config i.e

app:
  title: Janus IDP Backstage jai
  baseUrl: http://localhost:3000
  branding:
    iconLogo: ${BASE64_EMBEDDED_ICON_LOGO}

in chrome:

it updated the favicon icon to RH icon and not what's provided in the config by user in app-config.yaml as in downstream i could see below in app-config.dynamic-plugins.yaml#L402

```yaml
app:
  title: Red Hat Developer Hub
  branding:
    fullLogo: data:image/svg+xml;base64,<?xml version="1.0" encoding="utf-8"?>
<!-- Generator: Adobe Illustrator 27.3.1, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
<svg version="1.1" id="Logos" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
	 viewBox="0 0 931.8 244" style="enable-background:new 0 0 931.8 244;" xml:space="preserve">

      <path
        fill="#fff"
        d="M228.7 219.5v-72.8h25.7c5.5 0 10.7.9 15.4 2.8 4.7 1.9 8.8 4.4 12.2 7.7 3.4 3.3 6 7.1 8 11.6 1.9 4.5 2.9 9.3 2.9 14.4s-1 9.9-2.9 14.4c-1.9 4.4-4.6 8.3-8 11.5-3.4 3.2-7.5 5.8-12.2 7.6-4.7 1.9-9.8 2.8-15.4 2.8h-25.7zm25.8-63h-15v53.2h15c3.8 0 7.4-.7 10.7-2 3.3-1.4 6.1-3.2 8.5-5.6 2.4-2.4 4.3-5.2 5.7-8.4 1.4-3.2 2.1-6.7 2.1-10.5s-.7-7.2-2.1-10.5c-1.4-3.3-3.3-6.1-5.7-8.5-2.4-2.4-5.2-4.3-8.5-5.7-3.3-1.3-6.8-2-10.7-2zM300.7 193c0-3.7.7-7.3 2-10.6 1.4-3.3 3.2-6.2 5.6-8.7 2.4-2.5 5.2-4.4 8.4-5.8 3.2-1.4 6.7-2.1 10.5-2.1 3.6 0 7 .7 10.1 2.1 3.2 1.4 5.9 3.4 8.1 5.8 2.3 2.5 4 5.4 5.4 8.8 1.3 3.4 2 7 2 10.9v3H311c.7 4.4 2.7 8 6 10.9 3.3 2.9 7.3 4.3 11.9 4.3 2.6 0 5-.4 7.4-1.2 2.4-.8 4.4-2 6-3.4l6.7 6.6c-3.1 2.4-6.3 4.2-9.6 5.3-3.3 1.1-6.9 1.7-10.9 1.7-3.9 0-7.5-.7-10.9-2.1-3.4-1.4-6.3-3.3-8.8-5.8-2.5-2.4-4.5-5.3-5.9-8.7-1.5-3.5-2.2-7.1-2.2-11zm26.3-18.5c-4 0-7.5 1.3-10.4 4-2.9 2.6-4.8 6-5.5 10.2h31.4c-.7-4-2.5-7.4-5.4-10.1-2.9-2.7-6.3-4.1-10.1-4.1zM377.7 219.5l-22.9-52.9h11.4l16.5 39.6 16.5-39.6h11.1l-22.9 52.9h-9.7zM412.4 193c0-3.7.7-7.3 2-10.6 1.4-3.3 3.2-6.2 5.6-8.7 2.4-2.5 5.2-4.4 8.4-5.8 3.2-1.4 6.7-2.1 10.5-2.1 3.6 0 7 .7 10.1 2.1 3.2 1.4 5.9 3.4 8.1 5.8 2.3 2.5 4 5.4 5.4 8.8 1.3 3.4 2 7 2 10.9v3h-41.8c.7 4.4 2.7 8 6 10.9 3.3 2.9 7.3 4.3 11.9 4.3 2.6 0 5-.4 7.4-1.2 2.4-.8 4.4-2 6-3.4l6.7 6.6c-3.1 2.4-6.3 4.2-9.6 5.3-3.3 1.1-6.9 1.7-10.9 1.7-3.9 0-7.5-.7-10.9-2.1-3.4-1.4-6.3-3.3-8.8-5.8-2.5-2.4-4.5-5.3-5.9-8.7-1.5-3.5-2.2-7.1-2.2-11zm26.3-18.5c-4 0-7.5 1.3-10.4 4-2.9 2.6-4.8 6-5.5 10.2h31.4c-.7-4-2.5-7.4-5.4-10.1-2.9-2.7-6.3-4.1-10.1-4.1zM484.7 144.5v75.1h-10.4v-72.8l10.4-2.3zM494.5 193c0-3.8.7-7.4 2.1-10.8 1.4-3.4 3.4-6.3 5.9-8.7 2.5-2.5 5.4-4.4 8.8-5.8 3.4-1.4 7-2.1 10.8-2.1 3.8 0 7.4.7 10.8 2.1 3.4 1.4 6.3 3.4 8.7 5.8 2.5 2.5 4.4 5.4 5.8 8.7 1.4 3.4 2.1 7 2.1 10.8 0 3.9-.7 7.5-2.1 10.9-1.4 3.4-3.4 6.3-5.8 8.7-2.5 2.5-5.4 4.4-8.7 5.8-3.4 1.4-7 2.1-10.8 2.1-3.8 0-7.4-.7-10.8-2.1-3.4-1.4-6.3-3.4-8.8-5.8-2.5-2.5-4.5-5.4-5.9-8.7-1.4-3.4-2.1-7-2.1-10.9zm44.9 0c0-5.1-1.7-9.5-5.1-13-3.4-3.5-7.5-5.3-12.3-5.3s-8.9 1.8-12.3 5.3c-3.4 3.5-5.1 7.9-5.1 13s1.7 9.5 5 13.1c3.4 3.6 7.5 5.4 12.3 5.4 4.8 0 8.9-1.8 12.3-5.4 3.5-3.6 5.2-7.9 5.2-13.1zM559.3 241.1v-74.5h10.3v5c2.2-1.9 4.7-3.3 7.5-4.3s5.7-1.5 8.7-1.5c3.7 0 7.2.7 10.5 2.1 3.3 1.4 6.1 3.4 8.5 5.8 2.4 2.5 4.3 5.4 5.7 8.7 1.4 3.3 2.1 6.9 2.1 10.6 0 3.8-.7 7.4-2.1 10.7-1.4 3.3-3.3 6.2-5.7 8.7-2.4 2.5-5.3 4.4-8.6 5.8-3.3 1.4-6.9 2.1-10.7 2.1-3 0-5.8-.5-8.5-1.4-2.7-.9-5.1-2.2-7.3-3.8V241h-10.4zm25-66.3c-3.1 0-5.8.6-8.3 1.7-2.5 1.1-4.6 2.6-6.3 4.6v24.1c1.7 1.9 3.8 3.4 6.3 4.5 2.6 1.1 5.3 1.7 8.3 1.7 5.1 0 9.4-1.8 12.8-5.3 3.4-3.5 5.1-7.8 5.1-12.9 0-5.2-1.8-9.6-5.3-13.1-3.3-3.5-7.6-5.3-12.6-5.3zM620 193c0-3.7.7-7.3 2-10.6 1.4-3.3 3.2-6.2 5.6-8.7 2.4-2.5 5.2-4.4 8.4-5.8 3.2-1.4 6.7-2.1 10.5-2.1 3.6 0 7 .7 10.1 2.1 3.2 1.4 5.9 3.4 8.1 5.8 2.3 2.5 4 5.4 5.4 8.8 1.3 3.4 2 7 2 10.9v3h-41.8c.7 4.4 2.7 8 6 10.9 3.3 2.9 7.3 4.3 11.9 4.3 2.6 0 5-.4 7.4-1.2 2.4-.8 4.4-2 6-3.4l6.7 6.6c-3.1 2.4-6.3 4.2-9.6 5.3-3.3 1.1-6.9 1.7-10.9 1.7-3.9 0-7.5-.7-10.9-2.1-3.4-1.4-6.3-3.3-8.8-5.8-2.5-2.4-4.5-5.3-5.9-8.7-1.5-3.5-2.2-7.1-2.2-11zm26.3-18.5c-4 0-7.5 1.3-10.4 4-2.9 2.6-4.8 6-5.5 10.2h31.4c-.7-4-2.5-7.4-5.4-10.1-2.9-2.7-6.3-4.1-10.1-4.1zM681.9 219.5v-52.9h10.4v6.6c1.7-2.6 3.9-4.6 6.4-5.8 2.6-1.2 5.2-1.9 8-1.9 1.2 0 2.2.1 3.1.2.9.1 1.6.3 2.3.6v9.4c-.8-.3-1.8-.5-2.9-.8-1.1-.2-2.2-.4-3.3-.4-2.8 0-5.4.7-7.8 2.2-2.4 1.5-4.4 3.9-5.8 7.3v35.5h-10.4zM743.7 219.5v-72.8h10.9v31.2h38.7v-31.2h10.9v72.8h-10.9v-31.7h-38.7v31.7h-10.9zM828 166.6v31.5c0 4.1 1.2 7.3 3.5 9.8 2.4 2.4 5.6 3.6 9.7 3.6 2.8 0 5.3-.6 7.5-1.8 2.2-1.2 4.1-2.9 5.5-5.1v-38.1h10.4v52.9h-10.4v-5.3c-2.1 2.1-4.5 3.7-7.1 4.7-2.7 1.1-5.6 1.6-8.8 1.6-6 0-11-1.9-14.8-5.8-3.8-3.9-5.8-8.8-5.8-14.9v-33.3H828zM929.9 193c0 3.8-.7 7.4-2.1 10.7-1.4 3.3-3.3 6.2-5.7 8.7-2.4 2.5-5.3 4.4-8.6 5.8-3.3 1.4-6.9 2.1-10.7 2.1-3 0-5.8-.5-8.5-1.4s-5.2-2.2-7.4-4v4.5h-10.3v-72.8l10.4-2.3v27c2.2-1.9 4.7-3.3 7.4-4.3s5.6-1.5 8.7-1.5c3.7 0 7.2.7 10.5 2.1 3.3 1.4 6.1 3.4 8.5 5.8 2.4 2.5 4.3 5.4 5.7 8.7 1.4 3.6 2.1 7.2 2.1 10.9zm-28.2-18.2c-3.1 0-5.8.6-8.3 1.7-2.5 1.1-4.6 2.6-6.3 4.6v24.1c1.7 1.9 3.8 3.4 6.3 4.5 2.6 1.1 5.3 1.7 8.3 1.7 5.1 0 9.4-1.8 12.8-5.3 3.4-3.5 5.1-7.8 5.1-12.9 0-5.2-1.8-9.6-5.3-13.1-3.3-3.5-7.6-5.3-12.6-5.3z"
      />
  <g>
        <path
          d="M129 85c12.5 0 30.6-2.6 30.6-17.5 0-1.2 0-2.3-.3-3.4l-7.4-32.4c-1.7-7.1-3.2-10.3-15.7-16.6C126.4 10.2 105.3 2 99 2c-5.8 0-7.5 7.5-14.4 7.5-6.7 0-11.6-5.6-17.9-5.6-6 0-9.9 4.1-12.9 12.5 0 0-8.4 23.7-9.5 27.2-.3.7-.3 1.4-.3 1.9C44 54.8 80.3 85 129 85m32.5-11.4c1.7 8.2 1.7 9.1 1.7 10.1 0 14-15.7 21.8-36.4 21.8-46.8 0-87.7-27.4-87.7-45.5 0-2.8.6-5.4 1.5-7.3-16.8.8-38.6 3.8-38.6 23C2 107.2 76.6 146 135.7 146c45.3 0 56.7-20.5 56.7-36.6-.1-12.8-11-27.2-30.9-35.8"
          fill="#e00"
        />
    <path d="M161.5 73.6c1.7 8.2 1.7 9.1 1.7 10.1 0 14-15.7 21.8-36.4 21.8-46.8 0-87.7-27.4-87.7-45.5 0-2.8.6-5.4 1.5-7.3l3.7-9.1c-.3.7-.3 1.4-.3 1.9C44 54.8 80.3 85 129 85c12.5 0 30.6-2.6 30.6-17.5 0-1.2 0-2.3-.3-3.4l2.2 9.5z" />
    <path
      fill="#fff"
      d="M581.2 94.3c0 11.9 7.2 17.7 20.2 17.7 3.2 0 8.6-.7 11.9-1.7V96.5c-2.8.8-4.9 1.2-7.7 1.2-5.4 0-7.4-1.7-7.4-6.7V69.8h15.6V55.6h-15.6v-18l-17 3.7v14.3H570v14.2h11.3v24.5zm-52.9.3c0-3.7 3.7-5.5 9.3-5.5 3.7 0 7 .5 10.1 1.3v7.2c-3.2 1.8-6.8 2.6-10.6 2.6-5.5 0-8.8-2.1-8.8-5.6m5.2 17.6c6 0 10.8-1.3 15.4-4.3v3.4h16.8V75.6c0-13.6-9.1-21-24.4-21-8.5 0-16.9 2-26 6.1l6.1 12.5c6.5-2.7 12-4.4 16.8-4.4 7 0 10.6 2.7 10.6 8.3v2.7c-4-1.1-8.2-1.6-12.6-1.6-14.3 0-22.9 6-22.9 16.7 0 9.8 7.8 17.3 20.2 17.3m-92.4-1h18.1V82.4h30.3v28.8h18.1V37.6h-18.1v28.3h-30.3V37.6h-18.1v73.6zm-69-27.8c0-8 6.3-14.1 14.6-14.1 4.6 0 8.8 1.6 11.8 4.3V93c-3 2.9-7 4.4-11.8 4.4-8.2.1-14.6-6-14.6-14m26.6 27.8h16.8V33.9l-17 3.7v20.9c-4.2-2.4-9-3.7-14.2-3.7-16.2 0-28.9 12.5-28.9 28.5s12.5 28.6 28.4 28.6c5.5 0 10.6-1.7 14.9-4.8v4.1zm-77.2-42.7c5.4 0 9.9 3.5 11.7 8.8H310c1.7-5.5 5.9-8.8 11.5-8.8m-28.7 15c0 16.2 13.3 28.8 30.3 28.8 9.4 0 16.2-2.5 23.2-8.4l-11.3-10c-2.6 2.7-6.5 4.2-11.1 4.2-6.3 0-11.5-3.5-13.7-8.8h39.6V85c0-17.7-11.9-30.4-28.1-30.4-16.1.1-28.9 12.7-28.9 28.9m-29.3-30.4c6 0 9.4 3.8 9.4 8.3s-3.4 8.3-9.4 8.3h-17.9V53.1h17.9zm-36 58.1h18.1V84.4h13.8l13.9 26.8h20.2l-16.2-29.4c8.7-3.8 13.9-11.7 13.9-20.7 0-13.3-10.4-23.5-26-23.5h-37.7v73.6z"
    />
      </g>
</svg>

    iconLogo: data:image/svg+xml;base64,PHN2ZyBpZD0iTGF5ZXJfMSIgZGF0YS1uYW1lPSJMYXllciAxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAxOTIgMTQ1Ij48ZGVmcz48c3R5bGU+LmNscy0xe2ZpbGw6I2UwMDt9PC9zdHlsZT48L2RlZnM+PHRpdGxlPlJlZEhhdC1Mb2dvLUhhdC1Db2xvcjwvdGl0bGU+PHBhdGggZD0iTTE1Ny43Nyw2Mi42MWExNCwxNCwwLDAsMSwuMzEsMy40MmMwLDE0Ljg4LTE4LjEsMTcuNDYtMzAuNjEsMTcuNDZDNzguODMsODMuNDksNDIuNTMsNTMuMjYsNDIuNTMsNDRhNi40Myw2LjQzLDAsMCwxLC4yMi0xLjk0bC0zLjY2LDkuMDZhMTguNDUsMTguNDUsMCwwLDAtMS41MSw3LjMzYzAsMTguMTEsNDEsNDUuNDgsODcuNzQsNDUuNDgsMjAuNjksMCwzNi40My03Ljc2LDM2LjQzLTIxLjc3LDAtMS4wOCwwLTEuOTQtMS43My0xMC4xM1oiLz48cGF0aCBjbGFzcz0iY2xzLTEiIGQ9Ik0xMjcuNDcsODMuNDljMTIuNTEsMCwzMC42MS0yLjU4LDMwLjYxLTE3LjQ2YTE0LDE0LDAsMCwwLS4zMS0zLjQybC03LjQ1LTMyLjM2Yy0xLjcyLTcuMTItMy4yMy0xMC4zNS0xNS43My0xNi42QzEyNC44OSw4LjY5LDEwMy43Ni41LDk3LjUxLjUsOTEuNjkuNSw5MCw4LDgzLjA2LDhjLTYuNjgsMC0xMS42NC01LjYtMTcuODktNS42LTYsMC05LjkxLDQuMDktMTIuOTMsMTIuNSwwLDAtOC40MSwyMy43Mi05LjQ5LDI3LjE2QTYuNDMsNi40MywwLDAsMCw0Mi41Myw0NGMwLDkuMjIsMzYuMywzOS40NSw4NC45NCwzOS40NU0xNjAsNzIuMDdjMS43Myw4LjE5LDEuNzMsOS4wNSwxLjczLDEwLjEzLDAsMTQtMTUuNzQsMjEuNzctMzYuNDMsMjEuNzdDNzguNTQsMTA0LDM3LjU4LDc2LjYsMzcuNTgsNTguNDlhMTguNDUsMTguNDUsMCwwLDEsMS41MS03LjMzQzIyLjI3LDUyLC41LDU1LC41LDc0LjIyYzAsMzEuNDgsNzQuNTksNzAuMjgsMTMzLjY1LDcwLjI4LDQ1LjI4LDAsNTYuNy0yMC40OCw1Ni43LTM2LjY1LDAtMTIuNzItMTEtMjcuMTYtMzAuODMtMzUuNzgiLz48L3N2Zz4=
    theme:
      light:
        headerColor2: '#f56d6d'
        headerColor1: '#be0000'
        navigationIndicatorColor: '#be0000'
      dark:
        headerColor2: '#f56d6d'
        headerColor1: '#be0000'
        navigationIndicatorColor: '#be0000'

In firefox:

it shows default favicon icon i.e developer hub icon

In Safari:

no favicon icon is shown