### Summary
I'm fixing one or more of the following CI/CD misconfigurations to
improve security. Please feel free to leave a comment if you think the
current permissions for the GITHUB_TOKEN should not be restricted so I
can take a note of it as accepted behaviour.
- Restrict permissions for GITHUB_TOKEN
- Add step-security/harden-runner
- Pin Actions to a full length commit SHA
### Security Fixes
will fix https://github.com/neondatabase/cloud/issues/26141
## Problem
https://github.com/neondatabase/neon/actions/runs/14538136318/job/40790985693?pr=11645
failed, even though the relevant parts of the CI had passed and
auto-merge determined the PR is ready to merge. After that, commenting
failed.
## Summary of changes
- set GH_TOKEN for commenting after fast-forward failure
- allow merging with mergeable_state unstable
## Problem
When we release our components, we perform builds in the release PR,
then test the components, then merge the PR, and then build everything
*again*, run tests *again*, and only then start deployments.
To speed things up, we want to perform builds and run tests in the PR,
and start deployments using the existing artifacts from the release PR.
To make that possible, we need to have both CI pipelines running on the
same commit hash, which requires fast forwarding release. That only
works, if we have a commit in the PR that has the current release branch
state as an ancestor.
## Summary of changes
- Changes to release PR creation:
- Remove templates and automatic bodies for release PRs. The previous
template wasn't used anymore, and the automatic body we created in the
pipeline didn't contain any useful content anymore after the changees
here.
- Make it possible to select the source branch. For releases that aren't
cut from `main`, like https://github.com/neondatabase/neon/pull/11051,
we need a way to trigger the new flow from a different branch.
- Determine `release-branch` automatically from the component name
instead of passing that as well.
- Changes to the merge queue job:
- Rename `get-changed-files` to `meta` in preparation of additional data
being fetched as part of that job
- Fail the merge queue if we're trying to merge into a branch other than
main - this is to prevent non-fast-forward merges.
- Label PRs to branches other than main as `fast-forward`, to trigger
the fast-forward job
- Add a fast-forward job that can be triggered with the `fast-forward`
label that performs a fast-forward merge. This only happens if the PR
has `mergeable_state == clean`, so CI having passed.
- Build and Test on releases now skips building images, skips testing
images and skips triggering e2e tests. We add new tags to the images
from the release PR to tag them as release images, and we push them to
the prod registries.
