chore(CI): update GH Actions to only build multi-arch images

.github/workflows/build.yml

@@ -1,57 +1,52 @@
-name: Multi-arch build
+name: Docker Build Test
 
 on:
   push:
+    branches:
+      - main
+    paths-ignore:
+      - '**.md'
+  pull_request:
+    branches:
+      - main
     paths-ignore:
       - '**.md'
 
-env:
-  IMAGE_TAG: latest
-  IMAGE_REGISTRY: quay.io
-  IMAGE_REPOSITORY: crowdstrike/detection-container
+permissions:
+  contents: read
 
 jobs:
-  build-multiarch-image:
-    name: Build multi-architecture image
+  docker-build-test:
     runs-on: ubuntu-latest
-    permissions:
-      contents: read
-
+    timeout-minutes: 20
     steps:
-      - name: Install qemu dependency
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y qemu-user-static
-
-      - name: Checkout project
+      - name: Checkout code
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@29109295f81e9208d7d86ff1c6c12d2833863392 # v3.6.0
-
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3.11.1
-        with:
-          platforms: linux/arm64,linux/amd64,linux/s390x,linux/ppc64le
-
-      - name: Login to Docker Hub
-        uses: docker/login-action@184bdaa0721073962dff0199f1fb9940f07167d1 # v3.5.0
-        with:
-          registry: ${{ env.IMAGE_REGISTRY }}
-          username: ${{ secrets.REGISTRY_LOGIN }}
-          password: ${{ secrets.REGISTRY_PASSWORD }}
 
-      - name: Build and push
-        id: build_image_multiarch
+      - name: Build multi-platform Docker image
         uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6.18.0
         with:
           context: .
-          file: ./Dockerfile
-          platforms: linux/arm64,linux/amd64,linux/s390x,linux/ppc64le
-          push: true
+          platforms: linux/amd64,linux/arm64,linux/s390x,linux/ppc64le
+          push: false
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
           tags: |
-            ${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_REPOSITORY }}:${{ env.IMAGE_TAG }}
+            detection-container:test
+            detection-container:pr-${{ github.event.pull_request.number }}
 
-      - name: Check manifest
+      - name: Test Docker image (amd64)
         run: |
-          docker buildx imagetools inspect ${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_REPOSITORY }}:${{ env.IMAGE_TAG }}
+          docker buildx build \
+            --platform linux/amd64 \
+            --load \
+            --tag detection-container:test-local \
+            .
+
+          echo "Testing container starts successfully..."
+          docker run --rm detection-container:test-local echo ok
+
+          echo "Docker image smoke tests passed!"