Commit 0712a1b6 added a Python-based ingress_factory auth-comment check
that runs from scripts/tg on every plan/apply. The CI image
(forgejo.viktorbarzin.me/viktor/infra-ci) doesn't ship python3, so every
CI apply has been failing since with:
env: can't execute 'python3': No such file or directory
Adding python3 to the apk install line restores CI applies for all stacks.
The build-ci-image.yml pipeline auto-fires on this commit (path filter
on ci/Dockerfile), so the rebuild + retag happens without manual action.
aee434469c