ci: Use Dockerfile for operator when building images for trivy scans

.github/workflows/scan.yaml

@@ -1,9 +1,11 @@
 name: Scan
 on:
   pull_request:
+    branches:
+      - release-v2.9
   push:
     branches:
-      - main
+      - release-v2.9
     tags:
       - "v*"
 jobs:
@@ -14,6 +16,13 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: 'go.mod'
+          check-latest: true
+      - name: Build operator
+        run: make operator
       - name: Set up Docker Buildx
         id: buildx
         uses: docker/[email protected]
@@ -24,7 +33,7 @@ jobs:
           tags: ghcr.io/rancher/aks-operator:${{ github.sha }}
           load: true
           push: false
-          file: test/e2e/Dockerfile.e2e
+          file: package/Dockerfile
           build-args: |
             TAG=${{ github.sha }}
             REPO=ghcr.io/rancher/aks-operator