starting v2 and proxy support

src/main.ts

@@ -0,0 +1,37 @@
+import * as core from '@actions/core';
+import * as tc from '@actions/tool-cache';
+import * as installer from './installer';
+import * as path from 'path';
+
+export async function run() {
+  try {
+    //
+    // versionSpec is optional.  If supplied, install / use from the tool cache
+    // If not supplied then problem matchers will still be setup.  Useful for self-hosted.
+    //
+    let versionSpec = core.getInput('go-version');
+    let stable: boolean = (core.getInput('stable') || '').toUpperCase() == "TRUE";
+
+    if (versionSpec) {
+        let installDir: string | undefined = tc.find('go', versionSpec);
+
+        if (!installDir) {
+            installDir = await installer.downloadGo(versionSpec, stable);
+        }
+        
+        if (installDir) {
+            core.exportVariable('GOROOT', installDir);
+            core.addPath(path.join(installDir, 'bin'));
+        }   
+        else {
+            throw new Error(`Could not find a version that satisfied version spec: ${versionSpec}`);
+        }
+    }
+
+    // add problem matchers
+    const matchersPath = path.join(__dirname, '..', 'matchers.json');
+    console.log(`##[add-matcher]${matchersPath}`);
+  } catch (error) {
+    core.setFailed(error.message);
+  }
+}