Make some small changes according to review points

__tests__/setup-go.test.ts

@@ -85,7 +85,7 @@ describe('setup-go', () => {
     });
     logSpy.mockImplementation(line => {
       // uncomment to debug
-      process.stderr.write('log:' + line + '\n');
+      //process.stderr.write('log:' + line + '\n');
     });
     dbgSpy.mockImplementation(msg => {
       // uncomment to see debug output

dist/setup/index.js

@@ -3728,7 +3728,7 @@ function run() {
                 yield cache_restore_1.restoreCache(packageManager, cacheDependencyPath);
             }
             // add problem matchers
-            const matchersPath = path_1.default.join(process.cwd(), 'matchers.json');
+            const matchersPath = path_1.default.join(__dirname, '../..', 'matchers.json');
             core.info(`##[add-matcher]${matchersPath}`);
             // output the version actually being used
             let goPath = yield io.which('go');

src/main.ts

@@ -53,7 +53,7 @@ export async function run() {
     }
 
     // add problem matchers
-    const matchersPath = path.join(process.cwd(), 'matchers.json');
+    const matchersPath = path.join(__dirname, '../..', 'matchers.json');
     core.info(`##[add-matcher]${matchersPath}`);
 
     // output the version actually being used