change: split build job

.github/workflows/release.yml

@@ -6,17 +6,67 @@ on:
       - "v*"
 
 jobs:
+  # Build first because some Dockerfiles depend on the builder image
+  build-and-push-builder:
+    name: Build and push container image (builder)
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+      - uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
+        with:
+          submodules: recursive
+
+      - uses: nowsprinting/check-version-format-action@98485692a883d962227b09f40f29a63de0771299 # v4.0.2
+        id: version
+        with:
+          prefix: "v"
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@68827325e0b33c7199eb31dd4e31fbe9023e06e3 # v3.0.0
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@d70bba72b1f3fd22344832f00baa16ece964efeb # v3.3.0
+
+      - name: Login to ghcr.io
+        uses: docker/login-action@e92390c5fb421da1463c202d546fed0ec5c39f20 # v3.1.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@2cdde995de11925a030ce8070c3d77a52ffcf1c0 # v5.3.0
+        with:
+          platforms: linux/amd64,linux/arm64
+          file: build.Dockerfile
+          tags: ghcr.io/dena/unity-meta-check/unity-meta-check-builder:${{ github.ref_name }}
+          push: true
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Add latest tag
+        if: steps.version.outputs.is_stable == 'true'
+        uses: docker/build-push-action@2cdde995de11925a030ce8070c3d77a52ffcf1c0 # v5.3.0
+        with:
+          platforms: linux/amd64,linux/arm64
+          file: ghcr.io/dena/unity-meta-check/unity-meta-check-builder
+          tags: ghcr.io/dena/unity-meta-check/unity-meta-check-builder:latest
+          push: true
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
   build-and-push:
     name: Build and push container image
+    needs: build-and-push-builder
     runs-on: ubuntu-latest
     permissions:
       contents: read
 
     strategy:
       matrix:
         images:
-          - dockerfile: ./build.Dockerfile
-            image_name: ghcr.io/dena/unity-meta-check/unity-meta-check-builder
           - dockerfile: ./Dockerfile
             image_name: ghcr.io/dena/unity-meta-check/unity-meta-check
           - dockerfile: ./.github/images/Dockerfile