misc(v2): v1 backward compatibility for USE_SSH env var (#1880)

* misc(v2): address comments

* misc(v2): update CHANGELOG

CHANGELOG-2.x.md

@@ -7,6 +7,7 @@
 - Convert sitemap plugin to TypeScript.
 - Significantly reduce main bundle size and initial HTML payload on production build. Generated JS files from webpack is also shorter in name.
 - Refactor dark toggle into a hook.
+- Changed the way we read the `USE_SSH` env variable during deployment to be the same as in v1.
 
 ## 2.0.0-alpha.31
 

packages/docusaurus/src/commands/deploy.ts

@@ -67,9 +67,10 @@ export async function deploy(siteDir: string): Promise<void> {
     process.env.GITHUB_HOST || siteConfig.githubHost || 'github.com';
 
   const useSSH = process.env.USE_SSH;
-  const remoteBranch = useSSH
-    ? `git@${githubHost}:${organizationName}/${projectName}.git`
-    : `https://${gitUser}@${githubHost}/${organizationName}/${projectName}.git`;
+  const remoteBranch =
+    useSSH && useSSH.toLowerCase() === 'true'
+      ? `git@${githubHost}:${organizationName}/${projectName}.git`
+      : `https://${gitUser}@${githubHost}/${organizationName}/${projectName}.git`;
 
   // Check if this is a cross-repo publish
   const currentRepoUrl = shell