Add dashboard docker GH workflow

.github/workflows/publish-latest-dashboard-docker.yml

@@ -0,0 +1,56 @@
+name: Build elsa-dashboard:latest
+on:
+  workflow_dispatch:
+  push:
+    branches: 
+    - master
+  #release:
+  #  types: [published]
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to GitHub Packages
+    runs-on: ubuntu-latest
+
+    steps:          
+      - name: Checkout
+        uses: actions/checkout@v2
+          
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+        with:
+          platforms: all
+        
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+      
+      - name: Cache Docker layers
+        uses: actions/cache@v2
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+      
+      - name: Login to DockerHub
+        uses: docker/login-action@v1 
+        with:
+          username: ${{ secrets.DOCKER_USER }}
+          password: ${{ secrets.DOCKER_PASS }}
+      
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          builder: ${{ steps.buildx.outputs.name }}
+          context: .
+          file: ./docker/Dockerfile-elsa-dashboard
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
+          push: true
+          tags: elsa-dashboard:latest,elsa-workflows/elsa-dashboard:latest,${{ secrets.DOCKER_USER }}/elsa-dashboard:latest
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache
+          
+      - name: Image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}