Fix release script

We have to pin Grunt to 1.5.3, since this
is the latest version to support Node 10,
which is needed for the release process.

Also improved the Dockerfile and added
a warning related to "yo release".

Author: jaylinski

CONTRIBUTING.md

@@ -132,9 +132,11 @@ A full release via Docker may be completed with the following:
 
     # Generate config for yo generator-release:
     # https://github.com/kpdecker/generator-release#example
-    # You have to add a valid GitHub OAuth token!
-    RUN echo "module.exports = {\n  auth: 'oauth',\n  token: 'GitHub OAuth token'\n};" > /home/node/.config/generator-release
+    # You have to add a valid GitHub access token! (Used for reading issues and pull requests.)
+    RUN echo "module.exports = {\n  auth: 'oauth',\n  token: 'GitHub personal access token'\n};" > /home/node/.config/generator-release
     RUN chown -R node:node /home/node/.config
+    RUN chown -R node:node /home/node/.ssh
+    RUN chown -R node:node /home/node/tmp
 
     # Add the generated key to GitHub: https://github.com/settings/keys
     RUN ssh-keygen -q -t ed25519 -N '' -f /home/node/.ssh/id_ed25519 -C "release@handlebarsjs.com"
@@ -155,9 +157,12 @@ A full release via Docker may be completed with the following:
    * Add GitHub API token: `vi /home/node/.config/generator-release`
    * Execute the following steps:
      ```bash
-     npm ci
+     npm install
      npm install -g yo@1 grunt@1 generator-release
      npm run release
+     # Warning! This step will collect data from GitHub, bump the version,
+     # create a new commit, create a new tag and push it to GitHub.
+     # https://github.com/kpdecker/generator-release?tab=readme-ov-file#usage
      yo release
      npm login
      npm publish