ci: Fix Docker image test job on forks
Problem
PR check "Test Docker image build" is failing on PRs from forks. See https://github.com/PostHog/posthog/pull/10975#issuecomment-1195511287.
Changes
Trying to fix it.
I'm a bit stumped by this so asked a question in GitHub's forums: https://github.com/community/community/discussions/27348
This PR hasn't seen activity in a week! Should it be merged, closed, or further worked on? If you want to keep it open, post a comment or remove the stale label – otherwise this will be closed in another week.
I'm a bit stumped by this so asked a question in GitHub's forums: community/community#27348
Hey @Twixes can this PR be made ready for review without this PR check passing ?
We should be good to go now, thanks to using GitHub Actions artifacts instead of GitHub Container Registry! Thanks @hazzadous for doing the heavy lifting in https://github.com/PostHog/posthog/pull/11262