Merge branch 'main' into glitch-soc/merge-upstream

Conflicts:
- `README.md`:
  Discarded upstream changes: we have our own README
- `app/controllers/follower_accounts_controller.rb`:
  Port upstream's minor refactoring

.github/workflows/build-image.yml

@@ -17,6 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
+      - uses: hadolint/hadolint-action@v3.0.0
       - uses: docker/setup-qemu-action@v2
       - uses: docker/setup-buildx-action@v2
       - uses: docker/login-action@v2