fix: handle ValidationError fallback in setCommitsDefault, fix checkout@v6

- Catch ValidationError in setCommitsDefault to fall back to local git
  when auto-discovery fails (no local remote or no matching Sentry repo)
- Fix actions/checkout@v7 → v6 (v7 doesn't exist yet)

Author: BYK

.github/workflows/sentry-release.yml

@@ -27,7 +27,7 @@ jobs:
       # matching both the npm package version and Sentry release version.
       VERSION: ${{ github.event.release.tag_name || inputs.version }}
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

src/commands/release/set-commits.ts

@@ -142,6 +142,13 @@ async function setCommitsDefault(
       );
       return setCommitsFromLocal(org, version, cwd, depth);
     }
+    if (error instanceof ValidationError) {
+      log.warn(
+        `Auto-discovery failed: ${error.message}. ` +
+          "Falling back to local git history."
+      );
+      return setCommitsFromLocal(org, version, cwd, depth);
+    }
     throw error;
   }
 }