chore: add DOCS_GITHUB_TOKEN secret for updating karma documentation

We have a script, which is run as part of release process to automatically
update the documentation website:
https://github.com/karma-runner/karma-runner.github.com. The DOCS_GITHUB_TOKEN
secret contains a GitHub token with write access to the website repository.

.github/workflows/release.yml

@@ -16,6 +16,7 @@ jobs:
       SAUCE_ACCESS_KEY: ${{ secrets.SAUCE_ACCESS_KEY }}
       NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      DOCS_GITHUB_TOKEN: ${{ secrets.DOCS_GITHUB_TOKEN }}
       KARMA_TEST_NO_FALLBACK: 1
     steps:
       - uses: actions/checkout@v2

tools/update-docs.js

@@ -8,10 +8,11 @@ const success = async (pluginConfig, { nextRelease, logger }) => {
   const { name: docsPath } = dirSync()
 
   // This is a regular repository remote one would get if they click a Clone
-  // button on GitHub. The only added part is GH_TOKEN value in the `userinfo`
-  // part of the URL (https://en.wikipedia.org/wiki/URL), which allows GitHub
-  // to authenticate a user and authorise the push to the repository.
-  const repoOrigin = `https://${process.env.GH_TOKEN}@github.com/karma-runner/karma-runner.github.com.git`
+  // button on GitHub. The only added part is DOCS_GITHUB_TOKEN value in the
+  // `userinfo` part of the URL (https://en.wikipedia.org/wiki/URL), which
+  // allows GitHub to authenticate a user and authorise the push to the
+  // repository.
+  const repoOrigin = `https://${process.env.DOCS_GITHUB_TOKEN}@github.com/karma-runner/karma-runner.github.com.git`
 
   const options = { encoding: 'utf8', cwd: docsPath }