Upgrade to v4.2.12

Author: neet

.github/workflows/publish.yaml

@@ -18,7 +18,7 @@ jobs:
           repository: mastodon/mastodon
           path: ./mastodon
           fetch-depth: 1
-          ref: "v4.2.0-beta2"
+          ref: "v4.2.12"
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2
@@ -37,4 +37,4 @@ jobs:
         with:
           context: .
           push: true
-          tags: neetshin/mastodon-dev:latest
+          tags: neetshin/mastodon-dev:4.2.12