Add github job to build image (and not publish) on PR creation (#20)

Signed-off-by: Anil Vishnoi <vishnoianil@gmail.com>

.github/workflows/images-dryrun.yml

@@ -0,0 +1,105 @@
+name: Dry run docling-serve image building
+
+on:
+  pull_request:
+    branches: ["main"]
+
+env:
+  GHCR_REGISTRY: ghcr.io
+  GHCR_DOCLING_SERVE_CPU_IMAGE_NAME: ds4sd/docling-serve-cpu
+  GHCR_DOCLING_SERVE_GPU_IMAGE_NAME: ds4sd/docling-serve
+
+jobs:
+  build_cpu_image:
+    name: Build docling-serve "CPU only" container image
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+      attestations: write
+      id-token: write
+
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Cache Docker layers
+        uses: actions/cache@v4
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+
+      - name: Extract metadata (tags, labels) for docling-serve (CPU only) ghcr image
+        id: ghcr_serve_cpu_meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.GHCR_REGISTRY }}/${{ env.GHCR_DOCLING_SERVE_CPU_IMAGE_NAME }}
+
+      - name: Build docling-serve-cpu image
+        id: build-serve-cpu-ghcr
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: false
+          tags: ${{ steps.ghcr_serve_cpu_meta.outputs.tags }}
+          labels: ${{ steps.ghcr_serve_cpu_meta.outputs.labels }}
+          platforms: linux/amd64
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          file: Containerfile
+          build-args: |
+            --build-arg CPU_ONLY=true
+
+      - name: Remove Local Docker Images
+        run: |
+          docker image prune -af
+
+  build_gpu_image:
+    name: Build docling-serve (with GPU support) container image
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+      attestations: write
+      id-token: write
+
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Cache Docker layers
+        uses: actions/cache@v4
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+
+      - name: Extract metadata (tags, labels) for docling-serve (GPU) ghcr image
+        id: ghcr_serve_gpu_meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.GHCR_REGISTRY }}/${{ env.GHCR_DOCLING_SERVE_GPU_IMAGE_NAME }}
+
+      - name: Build docling-serve (GPU) image
+        id: build-serve-gpu-ghcr
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: false
+          tags: ${{ steps.ghcr_serve_gpu_meta.outputs.tags }}
+          labels: ${{ steps.ghcr_serve_gpu_meta.outputs.labels }}
+          platforms: linux/amd64,linux/arm64
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          file: Containerfile
+          build-args: |
+            --build-arg CPU_ONLY=false