Add GitHub Actions workflow for CI/CD

.github/workflows/ci.yml

@@ -0,0 +1,37 @@
+name: Docker Image CI for GHCR
+on:
+  push
+
+jobs:
+  build_and_publish:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+
+      - name: Set up JDK 1.17
+        uses: actions/setup-java@v2
+        with:
+          java-version: '17'
+          distribution: 'adopt'
+
+      - name: Build the package
+        run: mvn --batch-mode -DskipTests package
+
+      - name: Run the unit tests
+        run: mvn --batch-mode -Dmaven.test.failure.ignore=true test
+
+      - name: Report
+        uses: dorny/test-reporter@v1
+        if: always()
+        with:
+          name: Maven Tests
+          path: target/surefire-reports/*.xml
+          reporter: java-junit
+          fail-on-error: true
+
+      - name: Build and push the image
+        run: |
+          docker login --username abankhele --password ${{secrets.ACCESS_TOKEN}} ghcr.io
+          docker build -t ghcr.io/abankhele/primes-service:latest --file Dockerfile .  
+          docker push ghcr.io/abankhele/primes-service:latest