feat(scaffolder): Default the user and group id to the same as the host process for docker reasons

plugins/scaffolder-backend/src/scaffolder/stages/templater/helpers.test.ts

@@ -126,6 +126,25 @@ describe('helpers', () => {
       );
     });
 
+    it('should pass through the user and group id from the host machine', async () => {
+      await runDockerContainer({
+        imageName,
+        args,
+        templateDir,
+        resultDir,
+        dockerClient: mockDocker,
+      });
+
+      expect(mockDocker.run).toHaveBeenCalledWith(
+        imageName,
+        args,
+        expect.any(Stream),
+        expect.objectContaining({
+          User: `${process.getuid()}:${process.getgid()}`,
+        }),
+      );
+    });
+
     it('should pass through the log stream to the docker client', async () => {
       const logStream = new PassThrough();
       await runDockerContainer({

plugins/scaffolder-backend/src/scaffolder/stages/templater/helpers.ts

@@ -72,6 +72,10 @@ export const runDockerContainer = async ({
     });
   });
 
+  // Files that are created inside the Docker container will be owned by
+  // root on the host system on non Mac systems, because of reasons. Mainly the fact that
+  // volume sharing is done using NFS on Mac and actual mounts in Linux world.
+  // So we set the user in the container as the same user and group id as the host.
   const User = `${process.getuid()}:${process.getgid()}`;
 
   const [{ Error: error, StatusCode: statusCode }] = await dockerClient.run(