Adds github actions to build push docker container, removes travis (o…

…penhab#341)

Signed-off-by: Dan Cunningham <[email protected]>

.github/workflows/docker-publish.yml

@@ -0,0 +1,53 @@
+name: Docker
+
+on:
+  push:
+    # Publish `main` as Docker `latest` image.
+    branches:
+      - main
+
+    # Publish `v1.2.3` tags as releases.
+    tags:
+      - v*
+
+  # Run tests for any PRs.
+  pull_request:
+
+env:
+  IMAGE_NAME: ${{github.repository}}
+
+jobs:
+  push:
+
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push'
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Build image
+        run: docker build . --file Dockerfile --tag $IMAGE_NAME
+
+      - name: Log into registry
+        run: echo "${{ secrets.DOCKER_TOKEN }}" | docker login -u "${{ secrets.DOCKER_USER }}" --password-stdin
+
+      - name: Push image
+        run: |
+
+          # Change all uppercase to lowercase
+          IMAGE_NAME=$(echo $IMAGE_NAME | tr '[A-Z]' '[a-z]')
+
+          # Strip git ref prefix from version
+          VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
+
+          # Strip "v" prefix from tag name
+          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
+
+          # Use Docker `latest` tag convention
+          [ "$VERSION" == "main" ] && VERSION=latest
+
+          echo IMAGE_NAME=$IMAGE_NAME
+          echo VERSION=$VERSION
+
+          docker tag $IMAGE_NAME $IMAGE_NAME:$VERSION
+          docker push $IMAGE_NAME:$VERSION