add actions workload to build and publish images to ghcr (#1)

.github/workflows/docker-publish.yml

@@ -0,0 +1,56 @@
+name: Build Container Images
+
+on:
+  push:
+    branches: 
+      - main
+  # supports manualy running a workflow
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          - image: microsoft/defender-for-cloud/attacksimulation/victim
+            dockerpath: Images/victim
+          - image: microsoft/defender-for-cloud/attacksimulation/attacker
+            dockerpath: Images/attacker
+    permissions:
+      contents: read
+      packages: write
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ matrix.image }}
+          tags: |
+            # set latest tag for default branch
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Login to ${{ env.REGISTRY }}
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push Docker image
+        id: build-and-push
+        uses: docker/build-push-action@v5
+        with:
+          context: ${{ matrix.dockerpath }}
+          file: ${{ matrix.dockerpath }}/Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}