do not use path.join

Git uses forward slashes, even on windows

node-src/git/git.ts

@@ -8,7 +8,6 @@ import { Context } from '../types';
 import gitNoCommits from '../ui/messages/errors/gitNoCommits';
 import gitNotInitialized from '../ui/messages/errors/gitNotInitialized';
 import gitNotInstalled from '../ui/messages/errors/gitNotInstalled';
-import path from 'node:path';
 
 const newline = /\r\n|\r|\n/; // Git may return \n even on Windows, so we can't use EOL
 export const NULL_BYTE = '\0'; // Separator used when running `git ls-files` with `-z`
@@ -289,8 +288,10 @@ export async function findFilesFromRepositoryRoot(...patterns: string[]) {
 
   // Ensure patterns are referenced from the repository root so that running
   // from within a subdirectory does not skip the directories above
-  // e.g. /root/package.json and /root/**/package.json
-  const patternsFromRoot = patterns.map((pattern) => path.join(repoRoot, pattern));
+  // e.g. /root/package.json, /root/**/package.json
+  // Note that this does not use `path.join` to concatenate the file paths because
+  // git uses forward slashes, even on windows
+  const patternsFromRoot = patterns.map((pattern) => `${repoRoot}/${pattern}`);
 
   // Uses `--full-name` to ensure that all files found are relative to the repository root,
   // not the directory in which this is executed from

node-src/lib/findChangedDependencies.ts

@@ -39,13 +39,15 @@ export const findChangedDependencies = async (ctx: Context) => {
   ctx.log.debug({ rootPath, rootManifestPath, rootLockfilePath }, `Found manifest and lockfile`);
 
   // Handle monorepos with (multiple) nested package.json files.
-  const nestedManifestPaths = await findFilesFromRepositoryRoot(path.join('**', PACKAGE_JSON));
+  // Note that this does not use `path.join` to concatenate the file paths because
+  // git uses forward slashes, even on windows
+  const nestedManifestPaths = await findFilesFromRepositoryRoot(`**/${PACKAGE_JSON}`);
   const metadataPathPairs = await Promise.all(
     nestedManifestPaths.map(async (manifestPath) => {
       const dirname = path.dirname(manifestPath);
       const [lockfilePath] = await findFilesFromRepositoryRoot(
-        path.join(dirname, YARN_LOCK),
-        path.join(dirname, PACKAGE_LOCK)
+        `${dirname}/${YARN_LOCK}`,
+        `${dirname}/${PACKAGE_LOCK}`
       );
       // Fall back to the root lockfile if we can't find one in the same directory.
       return [manifestPath, lockfilePath || rootLockfilePath];