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

Conflicts:
- `.github/workflows/build-image.yml`:
  Upstream updated `docker/build-push-action`, and we a different config
  for `docker/metadata-action` so the lines directly above were different,
  but it's not a real conflict.
  Upgraded `docker/build-push-action` as upstream did.
- `app/javascript/mastodon/features/compose/components/compose_form.js`:
  Upstream changed the codestyle near a line we had modified to accommodate
  configurable character count.
  Kept our change.

app/javascript/packs/public-path.js

@@ -17,5 +17,5 @@ function formatPublicPath(host = '', path = '') {
 
 const cdnHost = document.querySelector('meta[name=cdn-host]');
 
-// eslint-disable-next-line camelcase, no-undef, no-unused-vars
+// eslint-disable-next-line no-undef
 __webpack_public_path__ = formatPublicPath(cdnHost ? cdnHost.content : '', process.env.PUBLIC_OUTPUT_PATH);