fix: log remote in git fetch errors

If git fetch fails we should clarify which remote was used to fetch
from.

src/git.ts

@@ -48,12 +48,12 @@ export class Git {
     );
     if (exitCode === 128) {
       throw new GitRefNotFoundError(
-        `Expected to fetch '${ref}', but couldn't find it`,
+        `Expected to fetch '${ref}' from '${remote}', but couldn't find it`,
         ref,
       );
     } else if (exitCode !== 0) {
       throw new Error(
-        `'git fetch origin ${ref}' failed with exit code ${exitCode}`,
+        `'git fetch ${remote} ${ref}' failed with exit code ${exitCode}`,
       );
     }
   }

src/test/git.test.ts

@@ -17,7 +17,7 @@ describe("git.fetch", () => {
         expect(error).toBeInstanceOf(GitRefNotFoundError);
         expect(error).toHaveProperty(
           "message",
-          "Expected to fetch 'unknown', but couldn't find it",
+          "Expected to fetch 'unknown' from 'origin', but couldn't find it",
         );
         expect(error).toHaveProperty("ref", "unknown");
       });