Add Dockerhub actions

.github/workflows/c-cpp.yml

@@ -13,7 +13,7 @@ on:
 
 jobs:
   linux:
-    name: Build for ARMv6 and ARMv7
+    name: Build for ARMv6 (compatible with v7 and Aarch64), and push to Dockerhub
     runs-on: ubuntu-latest
 
     steps:
@@ -27,3 +27,20 @@ jobs:
       run:  toolchain/toolchain.sh "download_build_libcurl"
     - name: Build Alertik for armv6
       run:  toolchain/toolchain.sh "build_alertik_armv6"
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+    - name: Login to Docker Hub
+      if: github.event_name == 'push'
+      uses: docker/login-action@v3
+      with:
+        username: ${{ secrets.DOCKERHUB_USERNAME }}
+        password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+    - name: Build and push Docker image for armv6/v7 and aarch64
+      uses: docker/build-push-action@v5
+      with:
+        context: .
+        push: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' }}
+        platforms: linux/arm/v6, linux/arm/v7, linux/arm64
+        tags: ${{ secrets.DOCKERHUB_USERNAME }}/alertik:latest