fix(ci): skip no-commit-to-branch in CI (#3)

Hotfix for the post-merge build of #2.

The buildah workflow runs pre-commit on every push to main. The bundled
`no-commit-to-branch` hook (in this repo's own
`.pre-commit-config.yaml`) is intended to block interactive commits to
`main`, not CI runs of pushes that already exist on main. With no `SKIP`
env, the hook fails and the post-merge image build/push to ghcr never
happens.

This adds `SKIP: no-commit-to-branch` to the pre-commit step — same
pattern `shared-workflows/.github/workflows/opentofu.yml` already uses.

Author: xnoto

.github/workflows/buildah.yml

@@ -78,6 +78,8 @@ jobs:
 
       - name: Run pre-commit
         uses: pre-commit/action@v3.0.1
+        env:
+          SKIP: no-commit-to-branch
 
       - name: Build image
         uses: redhat-actions/buildah-build@v2