add auto build of docker image

Author: arehbein-git

.github/workflows/main.yml

@@ -0,0 +1,19 @@
+name: Publish to Registry
+on:    
+  release:
+      types: [published]
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: Get release version
+      id: get_version
+      run: echo ::set-env name=RELEASE_VERSION::$(echo ${GITHUB_REF:10})
+    - name: Publish to Registry
+      uses: elgohr/Publish-Docker-Github-Action@master
+      with:
+        name: arehbein/pptag
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+        tags: "latest,${{ env.RELEASE_VERSION }}"