Update auto-release workflow for multi-arch build

- Add QEMU setup for multi-arch support
- Use Buildx for building Docker images
- Refactor GHCR login step
- Fix version stripping logic
- Set platforms for multi-arch builds

Author: scriptogre

.github/workflows/auto-release.yml

@@ -16,24 +16,32 @@ jobs:
       id-token: write
 
     steps:
-      - name: Checkout repository (containing the Dockerfile)
+      - name: Enable QEMU for multi-arch support
+        uses: docker/setup-qemu-action@v2
+        with:
+          platforms: all
+
+      - name: Boot up Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Check out code
         uses: actions/checkout@v4
 
-      - name: Authenticate with GHCR
+      - name: Login to GHCR
         uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - id: get-latest-release
-        name: Fetch latest TailwindCSS release
+      - name: Fetch latest TailwindCSS release
+        id: get-latest-release
         uses: pozetroninc/github-action-get-latest-release@v0.8.0
         with:
           repository: tailwindlabs/tailwindcss
 
-      - id: strip-v
-        name: Strip leading “v” from version
+      - name: Strip leading “v” from version
+        id: strip-v
         run: |
           # grab the raw output (e.g. "v4.1.7")
           vtag="${{ steps.get-latest-release.outputs.release }}"
@@ -42,12 +50,13 @@ jobs:
           # expose it as an output
           echo "version_no_v=${clean_vtag}" >> $GITHUB_OUTPUT
 
-      - name: Build and push Docker image
+      - name: Build & push multi-arch
         uses: docker/build-push-action@v4
         with:
           context: .
           file: Dockerfile
           push: true
+          platforms: linux/amd64, linux/arm64
           tags: |
             ghcr.io/scriptogre/tailwindcss:latest
             ghcr.io/scriptogre/tailwindcss:${{ steps.strip-v.outputs.version_no_v }}