Github: Add workflows for build and publish of Docker images

.github/workflows/build-image.yml

@@ -0,0 +1,24 @@
+name: Docker image build
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build the Docker image
+      run: >-
+        docker build . \
+          --file docker/Dockerfile \
+          --build-arg=BUILD_SERIES=dev \
+          --build-arg=BUILD_ID="$(echo "$GITHUB_SHA" | head -c 12)" \
+          --tag snikket/snikket-web-portal:dev
+    - name: Log into registry
+      run: echo "${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}" | docker login -u snikket --password-stdin
+    - name: Push the Docker image
+      run: docker push snikket/snikket-web-portal:dev