feat(temporal): add composite metric (backlog + running workflow count)

.github/workflows/custom-build-image.yml

@@ -0,0 +1,33 @@
+name: Build Custom KEDA Image
+
+on:
+  push:
+    branches:
+    - feature/temporal-scaler-composite-metric
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: $GITHUB_ACTOR
+          password: ${{ secrets.ORG_PAT_GITHUB }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          platforms: linux/amd64,linux/arm64
+          tags: ghcr.io/atlanhq/keda:2.18.3-temporal-composite-${{ github.sha }}