fix: prefix git auth with "x-access-token:" when run in a GitHub Action

lib/get-git-auth-url.js

@@ -3,16 +3,6 @@ const {isNil} = require('lodash');
 const hostedGitInfo = require('hosted-git-info');
 const {verifyAuth} = require('./git');
 
-const GIT_TOKENS = {
-  GIT_CREDENTIALS: undefined,
-  GH_TOKEN: undefined,
-  GITHUB_TOKEN: undefined,
-  GL_TOKEN: 'gitlab-ci-token:',
-  GITLAB_TOKEN: 'gitlab-ci-token:',
-  BB_TOKEN: 'x-token-auth:',
-  BITBUCKET_TOKEN: 'x-token-auth:',
-};
-
 /**
  * Determine the the git repository URL to use to push, either:
  * - The `repositoryUrl` as is if allowed to push
@@ -25,6 +15,18 @@ const GIT_TOKENS = {
  * @return {String} The formatted Git repository URL.
  */
 module.exports = async ({cwd, env, options: {repositoryUrl, branch}}) => {
+  const GIT_TOKENS = {
+    GIT_CREDENTIALS: undefined,
+    GH_TOKEN: undefined,
+    // GitHub Actions require the "x-access-token:" prefix for git access
+    // https://developer.github.com/apps/building-github-apps/authenticating-with-github-apps/#http-based-git-access-by-an-installation
+    GITHUB_TOKEN: isNil(env.GITHUB_ACTION) ? undefined : 'x-access-token:',
+    GL_TOKEN: 'gitlab-ci-token:',
+    GITLAB_TOKEN: 'gitlab-ci-token:',
+    BB_TOKEN: 'x-token-auth:',
+    BITBUCKET_TOKEN: 'x-token-auth:',
+  };
+
   const info = hostedGitInfo.fromUrl(repositoryUrl, {noGitPlus: true});
   const {protocol, ...parsed} = parse(repositoryUrl);