update build context

Author: dlinsley

.github/workflows/build-image.yml

@@ -23,11 +23,15 @@ jobs:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
       - name: Build and push Docker image
         id: push
         uses: docker/build-push-action@v6
         with:
-          context: "{{defaultContext:images}}"
+          context: ./images
           file: slingshot-scanner
           push: true
           tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest