adding docker image build.

.github/workflows/docker.yml

@@ -0,0 +1,71 @@
+name: Docker
+on:
+  push:
+    branches: [ main, docker_image ]
+    # Publish semver tags as releases.
+  release:
+    types: [published]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: true
+
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+      id-token: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+      # Login against a Docker registry except on PR
+      # https://github.com/docker/login-action
+      - name: Log into registry ${{ env.REGISTRY }}
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      # Extract metadata (tags, labels) for Docker
+      # https://github.com/docker/metadata-action
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          flavor: |
+            latest=true
+          tags: |
+            # if this is a tag'd build, prefix it with the flavor (eg. main-v1.2.3 and sandbox-v1.2.3)
+            type=ref,event=tag
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+      # Build and push Docker image with Buildx (don't push on PR)
+      # https://github.com/docker/build-push-action
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          platforms: linux/amd64,linux/arm64
+          context: .
+          file: Dockerfile
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+#          sbom: true
+#          sbom-dir: ./sbom-output
+#      - name: upload SBOM directory as a build artifact
+#        uses: actions/[email protected]
+#        with:
+#          path: ./sbom-output
+#          name: 'SBOM'
+#
+#      - name: upload spdx dependency
+#        uses: advanced-security/[email protected]
+#        with:
+#          filePath: ./sbom-output/