fix: preserve checked-out repo remote URL in configureGitAuth

configureGitAuth() was constructing the remote URL from
context.repository (GITHUB_REPOSITORY env var), which is always the
workflow's host repo. When actions/checkout checks out a different
repo, the action would overwrite the origin remote to point at the
wrong repository, breaking subsequent git push steps.

Now reads the current remote URL and injects the auth token into it,
preserving whatever repo actions/checkout set up. Falls back to the
previous context.repository behavior if reading the remote fails.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: 2 people

src/github/operations/git-config.ts

@@ -73,9 +73,21 @@ export async function configureGitAuth(
     await $`git config credential.helper ${helperPath}`;
     console.log("✓ Configured credential helper");
   } else {
-    // Update the remote URL to include the token for authentication
+    // Inject auth token into the existing remote URL, preserving the original
+    // repo (which may differ from context.repository if a different repo was checked out)
     console.log("Updating remote URL with authentication...");
-    const remoteUrl = `https://x-access-token:${githubToken}@${serverUrl.host}/${context.repository.owner}/${context.repository.repo}.git`;
+    let remoteUrl: string;
+    try {
+      const currentUrl = (await $`git remote get-url origin`.text()).trim();
+      const parsed = new URL(
+        currentUrl.endsWith(".git") ? currentUrl : currentUrl + ".git",
+      );
+      parsed.username = "x-access-token";
+      parsed.password = githubToken;
+      remoteUrl = parsed.toString();
+    } catch {
+      remoteUrl = `https://x-access-token:${githubToken}@${serverUrl.host}/${context.repository.owner}/${context.repository.repo}.git`;
+    }
     await $`git remote set-url origin ${remoteUrl}`;
     console.log("✓ Updated remote URL with authentication token");
   }