provide fallback cache keys

it's a lot faster to start from a 90% correct cache than an empty one

re: actions#286
re: actions#323
re: actions#328

Author: nigelzor

dist/setup/index.js

@@ -73046,8 +73046,9 @@ const restoreCache = (packageManager, cacheDependencyPath) => __awaiter(void 0,
     }
     const primaryKey = `node-cache-${platform}-${packageManager}-${fileHash}`;
     core.debug(`primary key is ${primaryKey}`);
+    const restoreKeys = [`node-cache-${platform}-${packageManager}-`];
     core.saveState(constants_1.State.CachePrimaryKey, primaryKey);
-    const cacheKey = yield cache.restoreCache([cachePath], primaryKey);
+    const cacheKey = yield cache.restoreCache([cachePath], primaryKey, restoreKeys);
     core.setOutput('cache-hit', Boolean(cacheKey));
     if (!cacheKey) {
         core.info(`${packageManager} cache is not found`);

src/cache-restore.ts

@@ -38,10 +38,11 @@ export const restoreCache = async (
 
   const primaryKey = `node-cache-${platform}-${packageManager}-${fileHash}`;
   core.debug(`primary key is ${primaryKey}`);
+  const restoreKeys = [`node-cache-${platform}-${packageManager}-`];
 
   core.saveState(State.CachePrimaryKey, primaryKey);
 
-  const cacheKey = await cache.restoreCache([cachePath], primaryKey);
+  const cacheKey = await cache.restoreCache([cachePath], primaryKey, restoreKeys);
   core.setOutput('cache-hit', Boolean(cacheKey));
 
   if (!cacheKey) {