ci: build builders

.github/workflows/cuda-builder.yml

@@ -1,4 +1,4 @@
-name: CUDA Builder
+name: cuda builder
 
 on:
   workflow_dispatch:
@@ -6,7 +6,12 @@ on:
     branches:
       - main
     paths:
-      - Containerfile
+      - cuda-builder.cf
+  pull_request:
+    branches:
+      - main
+    paths:
+      - cuda-builder.cf
 
 permissions:
   contents: read
@@ -23,8 +28,7 @@ jobs:
           - 12.9.0
           - 13.0.0
     steps:
-      - name: Normalize owner and set IMAGE_NAME
-        shell: bash
+      - shell: bash
         run: |
           echo "IMAGE_NAME=ghcr.io/${GITHUB_REPOSITORY_OWNER,,}/cuda-builder" >> "$GITHUB_ENV"
 
@@ -56,7 +60,7 @@ jobs:
         uses: docker/build-push-action@v5
         with:
           context: .
-          file: Containerfile
+          file: cuda-builder.cf
           build-args: |
             CUDA_TAG=${{ matrix.cuda_tag }}
           pull: true