Add Docker Image CI

.github/workflows/dockerimage.yml

@@ -0,0 +1,9 @@
+name: Docker Image CI
+on: [push]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build the Docker image
+      run: docker build . --file Dockerfile --tag ${{ github.repository }}:$(date +%s)