gobin: make sure GOPATH gets trimmed before use in path.join

On Windows, `go env GOPATH` keeps the end-line character, making it
unusable (see sample build failure:
https://github.com/fsouza/vod-module-sprite/runs/478762225?check_suite_focus=true#step:5:62).

__tests__/gobin.test.ts

@@ -20,4 +20,12 @@ describe('gobin', () => {
     const gobinPath = await gobin.getGOBIN('...');
     expect(gobinPath).toBe(path.join(gopath, 'bin'));
   });
+
+  it('should trim ${GOPATH} before using it', async () => {
+    let trimmed = gopath;
+    gopath = `${gopath}\r\n`;
+
+    const gobinPath = await gobin.getGOBIN('...');
+    expect(gobinPath).toBe(path.join(trimmed, 'bin'));
+  });
 });

dist/index.js

@@ -3280,7 +3280,7 @@ function getGOBIN(installDir) {
     return __awaiter(this, void 0, void 0, function* () {
         const goExecutable = path.join(installDir, 'bin', 'go');
         const result = yield execFile(goExecutable, ['env', 'GOPATH']);
-        const gopath = result.stdout;
+        const gopath = result.stdout.replace(/\s+$/, '');
         return path.join(gopath, 'bin');
     });
 }

src/gobin.ts

@@ -8,6 +8,6 @@ export async function getGOBIN(installDir: string): Promise<string> {
   const goExecutable = path.join(installDir, 'bin', 'go');
 
   const result = await execFile(goExecutable, ['env', 'GOPATH']);
-  const gopath = result.stdout;
+  const gopath = result.stdout.replace(/\s+$/, '');
   return path.join(gopath, 'bin');
 }