Update default branch in CI and fix pushing to marketplace

[turkenh]

Description of your changes

Follow up on #132

Looks like, we cannot login to multiple orgs in Upbound marketplace with their tokens and push them. It looks like the latter login overrides the previous ones.

I have:

• Read and followed Crossplane's contribution process.
• Run make reviewable to ensure this PR is ready for review.
• Added or updated unit tests.
• Added or updated e2e tests.
• Linked a PR or a docs tracking issue to document this change.
• Added backport release-x.y labels to auto-backport this PR.

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[haarchri]

yeah use this way than

[turkenh]

It looks like docker login simply ignores whatever I put after the registry url, so it is not possible to login using two different tokens for different accounts at the same time:

❯ docker login -u $(jq -r '.Username' ~/.up/space.token.json) -p $(jq -r '.Secret' ~/.up/space.token.json) xpkg.upbound.io/some-arbitrary-repositry123
WARNING! Using --password via the CLI is insecure. Use --password-stdin.
Login Succeeded

I logged in xpkg.upbound.io/some-arbitrary-repositry123 above, and I am only seeing this added to my ~/.docker/config.json
❯ cat ~/.docker/config.json
{
	"auths": {
		"xpkg.upbound.io": {}
	},
	"credsStore": "osxkeychain"
}

Related: moby/moby#37569 (comment)

[github-actions]

Backport failed for release-1.15, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin release-1.15
git worktree add -d .worktree/backport-136-to-release-1.15 origin/release-1.15
cd .worktree/backport-136-to-release-1.15
git switch --create backport-136-to-release-1.15
git cherry-pick -x 3f5f7064e145ce381fe1807d032fe051e95ae9ab

[github-actions]

Backport failed for release-1.16, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin release-1.16
git worktree add -d .worktree/backport-136-to-release-1.16 origin/release-1.16
cd .worktree/backport-136-to-release-1.16
git switch --create backport-136-to-release-1.16
git cherry-pick -x 3f5f7064e145ce381fe1807d032fe051e95ae9ab