Create publish_docker_image.yml

Author: macbre

.github/workflows/publish_docker_image.yml

@@ -0,0 +1,33 @@
+name: Publish Docker image to pkg.github.com
+
+# https://help.github.com/en/actions/reference/events-that-trigger-workflows
+on:
+  # push: # debug
+  release:
+    types: [ published ]
+
+jobs:
+  build:
+    # shared env variables
+    env:
+        DOCKER_REPOSITORY: docker.pkg.github.com
+        DOCKER_IMAGE_NAME: elecena/python-php/base  # follow OWNER/REPOSITORY/IMAGE_NAME schema
+        DOCKER_PUSH_USER: elecena  # this can be anything, Github token is used to log into the registry
+        
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+
+    # https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-commands-for-github-actions#setting-an-environment-variable
+    # e.g. docker.pkg.github.com/elecena/backend/bots-worker:1.9
+    - name: Set Docker image name and release tag
+      run: echo "DOCKER_TAG=${DOCKER_REPOSITORY}/${DOCKER_IMAGE_NAME}:${GITHUB_REF:10}" >> $GITHUB_ENV
+
+    - name: Build the Docker image
+      run: docker build . --tag ${DOCKER_TAG} --build-arg GITHUB_SHA=${GITHUB_SHA}
+
+    # https://docs.github.com/en/free-pro-team@latest/actions/reference/authentication-in-a-workflow
+    - name: Log in and publish to Registry
+      run: |
+        echo ${{ secrets.GITHUB_TOKEN }} | docker login ${DOCKER_REPOSITORY} -u ${DOCKER_PUSH_USER} --password-stdin
+        docker push ${DOCKER_TAG}