add arm images (#135)

Signed-off-by: Joe Elliott <number101010@gmail.com>

.github/workflows/release.yml

@@ -13,10 +13,16 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           fetch-depth: 0
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
       - name: Set up Go ^1.18
         uses: actions/setup-go@v2
         with:
@@ -35,7 +41,7 @@ jobs:
           CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
 
       - name: Log in to Docker Hub
-        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
+        uses: docker/login-action@v2
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
@@ -47,9 +53,10 @@ jobs:
           images: joeelliott/cert-exporter
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
+        uses: docker/build-push-action@v4
         with:
           context: .
+          platforms: linux/amd64,linux/arm64
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}