add runner OS in cache key (#220)

dist/restore/index.js

@@ -77314,6 +77314,9 @@ class CacheConfig {
                 key += `-${job}`;
             }
         }
+        // Add runner OS to the key to avoid cross-contamination of cache
+        const runnerOS = external_os_default().type();
+        key += `-${runnerOS}`;
         self.keyPrefix = key;
         // Construct environment portion of the key:
         // This consists of a hash that considers the rust version