Create dockerhub.yml

Github Action to build & push image to docker hub

.github/workflows/dockerhub.yml

@@ -0,0 +1,44 @@
+# Just followed https://docs.docker.com/ci-cd/github-actions/
+#
+
+name: Build and publish to Docker Hub
+
+on:
+  push:
+    branches: [master]
+
+# Environment variables available to all jobs and steps in this workflow
+env:
+  DOCKER_HUB_USERNAME: ${{ secrets.DOCKER_HUB_USERNAME }}
+  DOCKER_HUB_ACCESS_TOKEN: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+
+jobs:
+  build-publish:
+    name: Build, Publish
+    runs-on: ubuntu-latest
+    steps:
+
+    # Download and Install IBM Cloud CLI
+    - name: Login to Docker Hub
+      uses: docker/login-action@v1
+      with:
+        username: ${{ DOCKER_HUB_USERNAME }}
+        password: ${{ DOCKER_HUB_ACCESS_TOKEN }}
+
+    - name: Set up Docker Buildx
+      id: buildx
+      uses: docker/setup-buildx-action@v1
+
+    # Build the Docker image
+    - name: Build and push
+      id: docker_build
+      uses: docker/build-push-action@v2
+      with:
+          context: ./
+          file: ./Dockerfile-alpine
+          push: true
+          tags: nicobot:dev
+
+    # Push the image to IBM Container Registry
+    - name: Image digest
+      run: echo ${{ steps.docker_build.outputs.digest }}