CI: Patch MODULE.bazel in nanobind example

Done via a small Python script for portability. This ensures that we test
the nanobind example build against the latest version in CI.

.github/workflows/lint-and-test.yaml

@@ -54,6 +54,9 @@ jobs:
           repository: wjakob/nanobind_example
           path: nanobind_example
           ref: bazel
+      - name: Override nanobind_bazel pin in MODULE.bazel
+        run: python fixup_module_bazel.py
+        working-directory: ${{ github.workspace }}/nanobind_example
 
       - name: Build and test nanobind_example on ${{ matrix.os }}
         run: |

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
   -   repo: https://github.com/keith/pre-commit-buildifier
-      rev: 7.3.1
+      rev: 7.3.1.1
       hooks:
       -   id: buildifier
       -   id: buildifier-lint

fixup_module_bazel.py

@@ -0,0 +1,36 @@
+"""
+Redeclare a dependency on nanobind_bazel by overwriting the content of MODULE.bazel.
+
+Used in nanobind-bazel CI to test against development versions in pull requests.
+"""
+
+import re
+from pathlib import Path
+
+# TODO: Support arbitrary paths in the template below
+_LOCAL_NANOBIND_BAZEL = """
+bazel_dep(name = "nanobind_bazel", version = "")
+local_path_override(
+    module_name = "nanobind_bazel",
+    path = "../nanobind-bazel",
+)
+"""
+
+
+def main():
+    # TODO: Grab the path to MODULE.bazel from sys.argv.
+    module_bazel = Path("MODULE.bazel")
+    if not module_bazel.exists():
+        raise FileNotFoundError(module_bazel)
+
+    content = module_bazel.read_text()
+    module_bazel.write_text(
+        re.sub(
+            r"bazel_dep\(name = \"nanobind_bazel\", version = [\w\".]*\)",
+            _LOCAL_NANOBIND_BAZEL,
+            content,
+        )
+    )
+
+if __name__ == "__main__":
+    main()