Add GitHub Actions (deploy to Docker Hub)

.github/workflows/on_release.yml

@@ -0,0 +1,35 @@
+name: Deploy to Docker Hub
+
+on:
+  release:
+    types: [published]
+
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Checkout source code
+      uses: actions/checkout@v1
+
+
+    - name: Deploy to Docker Hub
+      if: success() && startsWith(github.ref, 'refs/tags/v')
+      env:
+        GITHUB_REF_TAG: ${{ github.ref }}
+        DOCKER_REGISTRY: docker.io
+        DOCKER_IMAGE: grafolean/grafolean-netflow-bot
+        DOCKER_USER: grafolean
+        DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
+      run: |
+        export VERSION=${GITHUB_REF_TAG:10:50}
+        echo "Version is $VERSION"
+        export LAST_KNOWN_VERSION=`git tag -l --sort=-version:refname "v*.*.*" | grep -v rc | head -n 1 | tr -d '[:space:]'`
+        echo "Last known version is $LAST_KNOWN_VERSION"
+        docker login -u $DOCKER_USER -p $DOCKER_PASSWORD $DOCKER_REGISTRY
+        docker build -t "docker.io/$DOCKER_IMAGE:$VERSION" -t "docker.io/$DOCKER_IMAGE:latest" --build-arg VERSION=$VERSION --build-arg VCS_REF=$GITHUB_SHA --build-arg BUILD_DATE=$(date -u +'%Y-%m-%dT%H:%M:%SZ') .
+        [ "$LAST_KNOWN_VERSION" == "$VERSION" ] && docker tag "docker.io/$DOCKER_IMAGE:$VERSION" "docker.io/$DOCKER_IMAGE:latest" || echo "NOT MARKING AS LATEST!"
+        docker images
+        docker push "docker.io/$DOCKER_IMAGE:$VERSION"
+        [ "$LAST_KNOWN_VERSION" == "$VERSION" ] && docker push "docker.io/$DOCKER_IMAGE:latest" || echo "NOT LATEST!"