[envoy] Support Azure Marketplace

[kota2and3kan]

Description

This PR updates the Envoy Helm Chart to support Azure Marketplace.

To list Scalar products (ScalarDB Cluster and ScalarDL) on the Azure Marketplace, we have to update our helm chart based on the rules of Azure Marketplace. So, I updated Envoy chart as follows:

• Update spec.template.spec.containers[].image in the deployment.yaml file to pull the container image from ACR for Azure Marketplace.

Also, I added the condition (if statement) based on the value of global.platform. Basically, Envoy chart is used as subchart from Scalar products charts (main charts). So, this global.platform value is passed from the main chart. However, we must set default value in values.yaml on the Envoy chart side.

You can see more details on the Azure Marketplace support on the ScalarDB Cluster's PR side.
#275

Please take a look!

Related issues and/or PRs

• I updated the ScalarDB Cluster chart in the following PR.
  • [scalardb-cluster] Support Azure Marketplace #275

Changes made

• Update charts/envoy/templates/deployment.yaml to add the Azure Marketplace dedicated configurations.
• Update charts/envoy/values.yaml to add global.platform that is used for switching assumed platform.
• charts/envoy/README.md and charts/envoy/values.yaml are updated automatically based on values.yaml.

Checklist

• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation to reflect the changes.
• Any remaining open issues linked to this PR are documented and up-to-date (Jira, GitHub, etc.).
• Tests (unit, integration, etc.) have been added for the changes.
• My changes generate no new warnings.
• Any dependent changes in other PRs have been merged and published.

Additional notes (optional)

N/A

Release notes

N/A

[feeblefakie]

LGTM! Thank you!