Merge commit '6273416292090b2f6bfda33f070cea325a1759df' into glitch-soc/merge-upstream

Conflicts:
- `.github/workflows/build-nightly.yml`:
  Upstream modified this file close to a line modified by glitch-soc to
  disable the ARMv64 builder (as glitch-soc doesn't have one).
  Ported upstream's changes.
- `.github/workflows/build-releases.yml`:
  Upstream modified this file close to lines changed by glitch-soc to
  change the Docker image repositories used (only ghcr, and based on the
  organization's name).
  Ported upstream's changes.

.github/workflows/build-nightly.yml

@@ -26,6 +26,7 @@ jobs:
     with:
       platforms: linux/amd64,linux/arm64
       use_native_arm64_builder: false
+      cache: false
       push_to_images: |
         ghcr.io/${{ github.repository_owner }}/mastodon
       version_prerelease: ${{ needs.compute-suffix.outputs.prerelease }}