Skip devcontainer unless C++/Python/devcontainer files were touched

Author: bdice

.github/workflows/pr.yaml

@@ -70,6 +70,9 @@ jobs:
     uses: rapidsai/shared-workflows/.github/workflows/changed-files.yaml@main
     with:
       files_yaml: |
+        build_devcontainer:
+          - '.devcontainer/**'
+          - '!.devcontainer/**/*.md'
         build_docs:
           - '**'
           - '!.ai/**'
@@ -607,6 +610,12 @@ jobs:
         env:
           GH_TOKEN: ${{ github.token }}
   devcontainer:
+    needs: changed-files
+    if: >-
+      fromJSON(needs.changed-files.outputs.changed_file_groups).build_devcontainer ||
+      fromJSON(needs.changed-files.outputs.changed_file_groups).test_cpp ||
+      fromJSON(needs.changed-files.outputs.changed_file_groups).test_python_conda ||
+      fromJSON(needs.changed-files.outputs.changed_file_groups).test_python_wheels
     permissions:
       actions: read
       contents: read