Add the functionality to set the checkout-reference

Author: neurolag

publish-extension.js

@@ -38,7 +38,7 @@ const { createVSIX } = require('vsce');
             options = { extensionFile: context.file };
         } else if (context.repo && context.ref) {
             console.log(`${id}: preparing from ${context.repo}...`);
-            await exec(`git checkout ${context.ref}`, { cwd: context.repo });
+            await exec(`git checkout ${extension.checkout || context.ref}`, { cwd: context.repo });
             let yarn = await new Promise(resolve => {
                 fs.access(path.join(context.repo, 'yarn.lock'), error => resolve(!error));
             });

types.d.ts

@@ -55,6 +55,7 @@ export interface Extensions {
 export interface Extension {
     id: string,
     repository?: string
+    checkout?: string
     location?: string
     prepublish?: string
     extensionFile?: string