Feat: Build darknet release based on git tag and ignore pushes to mas…

…ter branch

This allows us to use specific builds in ODC instead of using whatever was
in master at the time of building the ODC docker image

Closes opendatacam/opendatacam#436

.github/workflows/ci-cd.yml

@@ -9,19 +9,23 @@ on:
   pull_request:
     branches-ignore:
       - 'gh-pages'
+  release:
+    types: [created]
 
 jobs:
   # Build docker images
   build-docker-and-publish:
     runs-on: ubuntu-latest
     # needs: build-and-test-code
     env:
-      # Publish to Docker Hub if we have a change in the development or master branch
-      DOCKERHUB_PUBLISH: ${{ github.event_name == 'push' && (github.event.ref == 'refs/heads/development' || github.event.ref == 'refs/heads/master') && secrets.DOCKERHUB_USERNAME != '' }}
+      # Only publish to Docker Hub if the dockerhub username is set, and either happens
+      #
+      # - we have a change in the development branch
+      # - we have a new tag
+      DOCKERHUB_PUBLISH: ${{ (github.event_name == 'push' && (github.event.ref == 'refs/heads/development' || startsWith(github.event.ref, 'refs/tags/')) || github.event_name == 'release') && secrets.DOCKERHUB_USERNAME != '' }}
       # In case we run a pull request, the secrets are not available to us. Therefore check first
       # and assign a 'dummy' dockerhub username
       DOCKERHUB_USERNAME: ${{ ( secrets.DOCKERHUB_USERNAME != '' && secrets.DOCKERHUB_USERNAME ) || 'dummy' }}
-      DOCKERHUB_TAG_SUFFIX: ${{ ( github.event.ref == 'refs/heads/development' && format('{0}-{1}', matrix.platform, 'development') ) || ( github.event.ref == 'refs/heads/master' && matrix.platform ) || format('{0}-{1}', matrix.platform, 'dummy') }}
     strategy:
       matrix:
         include:
@@ -46,11 +50,22 @@ jobs:
           # Use the secrets directly and not the validated environment DOCKERHUB_USERNAME
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Determine dockerhub tag
+        id: dockerhub-tag
+        # Determine the dockerhub tag based on if our current working tree points to a tag or not
+        # the tags will either be `<tag>-<platform>` or `development-<platform>`
+        run: |
+          GIT_TAG=$(git tag -l --points-at $(git log -n 1 --format=%H))
+          if [ ! -z $GIT_TAG ]; then
+            echo "::set-output name=dockerhub-tag::$GIT_TAG-${{ matrix.platform }}"
+          else
+            echo "::set-output name=dockerhub-tag::development-${{ matrix.platform }}"
+          fi
       - name: Build and push
         uses: docker/build-push-action@v2
         with:
           context: ./
           file: docker/build/${{ matrix.platform }}/Dockerfile
           platforms: ${{ matrix.docker-platform }}
           push: ${{ env.DOCKERHUB_PUBLISH == 'true' }}
-          tags: ${{ env.DOCKERHUB_USERNAME }}/opendatacam-darknet-base:${{ env.DOCKERHUB_TAG_SUFFIX }}
+          tags: ${{ env.DOCKERHUB_USERNAME }}/opendatacam-darknet-base:${{ steps.dockerhub-tag.outputs.dockerhub-tag }}