Add gh action wf to build test worker image

Author: chrishagglund-ship-it

.github/workflows/harness-image.yml

@@ -0,0 +1,61 @@
+name: Harness Worker Image
+
+on:
+  push:
+    branches: [main, certification-worker]
+    paths:
+      - "Dockerfile"
+      - "harness/**"
+      - "src/**"
+      - "package.json"
+      - "package-lock.json"
+      - ".github/workflows/harness-image.yml"
+  release:
+    types: [published]
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/conductor-oss/javascript-sdk/harness-worker
+          tags: |
+            type=raw,value=latest
+            type=raw,value=${{ github.event.release.tag_name }},enable=${{ github.event_name == 'release' }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./Dockerfile
+          target: harness
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}