ci: introduce dogfooding check on release

[hf]

Adds a dogfooding check on release, i.e. making sure that the RC version being released has already been out on Supabase production & staging.

It works by adding a mandatory dogfooding check on every PR. If the PR is one for Release Please, upon giving approval to merge, the check will re-run ensuring that the latest RC is in fact deployed. If it is not, the check will fail, blocking the merge.

[coveralls]

Pull Request Test Coverage Report for Build 12724092540

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 65.435%

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Totals
Change from base Build 12707782762:	0.0%
Covered Lines:	9814
Relevant Lines:	14998

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💛 - Coveralls