.gitea/workflows/docker-builder.yml aktualisiert

add runner for buildx build arm64

.gitea/workflows/docker-builder.yml

@@ -32,7 +32,12 @@ jobs:
             git.pi-farm.de \
             -u ${{ secrets.REGISTRY_USER }} \
             --password-stdin
-
+            
+      - name: Setup Docker Buildx
+              run: |
+                docker buildx create --name multiarch --use || docker buildx use multiarch
+                docker buildx inspect --bootstrap
+              
       - name: Build & push amd64
         run: |
           docker build \
@@ -42,9 +47,11 @@ jobs:
             -t git.pi-farm.de/pi-farm/docker-baseimage-alpine:${VERSION} .
           docker push git.pi-farm.de/pi-farm/docker-baseimage-alpine:${VERSION}
       
-      - name: Build & push arm64
-        run: |
-          docker build \
+
+      - name: Build & push multi-arch image
+         run: |
+          docker buildx build \
+            --platform linux/arm64 \
             -f Dockerfile.aarch64 \
             --build-arg BUILD_DATE=${BUILD_DATE} \
             --build-arg VERSION=${VERSION} \