Backport container build changes to the stable-4.1 branch (#26738)

Co-authored-by: Renaud Chaput <renchap@gmail.com>

.github/workflows/build-releases.yml

@@ -0,0 +1,27 @@
+name: Build container release images
+on:
+  push:
+    tags:
+      - '*'
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  build-image:
+    uses: ./.github/workflows/build-container-image.yml
+    with:
+      platforms: linux/amd64,linux/arm64
+      use_native_arm64_builder: true
+      push_to_images: |
+        tootsuite/mastodon
+        ghcr.io/mastodon/mastodon
+      # Only tag with latest when ran against the latest stable branch
+      # This needs to be updated after each minor version release
+      flavor: |
+        latest=${{ startsWith(github.ref, 'refs/tags/v4.1.') }}
+      tags: |
+        type=pep440,pattern={{raw}}
+        type=pep440,pattern=v{{major}}.{{minor}}
+    secrets: inherit