add bin to path

src/installer.ts

@@ -1,9 +1,12 @@
 import * as tc from '@actions/tool-cache';
+import * as cm from '@actions/core';
 import * as path from 'path';
 import * as semver from 'semver';
 import * as httpm from '@actions/http-client';
 import * as sys from './system';
 import {debug} from '@actions/core';
+import * as cp from 'child_process';
+import * as fs from 'fs';
 
 export async function downloadGo(
   versionSpec: string,
@@ -34,6 +37,8 @@ export async function downloadGo(
       // extracts with a root folder that matches the fileName downloaded
       const toolRoot = path.join(extPath, 'go');
       toolPath = await tc.cacheDir(toolRoot, 'go', makeSemver(match.version));
+
+      addBinToPath();
     }
   } catch (error) {
     throw new Error(`Failed to download version ${versionSpec}: ${error}`);
@@ -55,6 +60,17 @@ export interface IGoVersion {
   files: IGoVersionFile[];
 }
 
+export async function addBinToPath() {
+  let buf = cp.execSync('go env GOPATH');
+  if (buf) {
+    let d = buf.toString().trim();
+    let bp = path.join(d, 'bin');
+    if (fs.existsSync(bp)) {
+      cm.addPath(bp);
+    }
+  }
+}
+
 export async function findMatch(
   versionSpec: string,
   stable: boolean