feat: build and push workflow

.github/workflows/build.yml

@@ -0,0 +1,45 @@
+name: Docker Build and Push
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+concurrency:
+  group: docker-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Docker Hub
+        if: github.event_name == 'push'
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build Docker image
+        run: |
+          docker build . -t ghcr.io/zeuswpi/haldis_een_prijsje:pr-${{ github.sha }}
+          if [ "${{ github.event_name }}" == "push" ]; then
+            docker tag ghcr.io/zeuswpi/haldis_een_prijsje:pr-${{ github.sha }} ghcr.io/zeuswpi/haldis_een_prijsje:latest
+          fi
+
+      - name: Push Docker image
+        if: github.event_name == 'push'
+        run: docker push --all-tags ghcr.io/zeuswpi/haldis_een_prijsje