Tweak release instructions (#829)

CONTRIBUTING.md

@@ -86,6 +86,12 @@ If you would like to hack on MUI Toolpad or want to run the latest version, you
 
    Running this command requires a [Github personal access token](https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/creating-a-personal-access-token) with the `public_repo` scope.
 
+   Set `GITHUB_TOKEN` variable in `.env` file so to avoid passing it with command every time
+
+   **OR**
+
+   pass token with argument `--githubToken YOUR_TOKEN`
+
 1. Copy the generated changelog from the console, clean it up, add a short summary of the release highlights and use the new version number as the title.
 
 1. Prepend the changelog to [`CHANGELOG.md`](./CHANGELOG.md).
@@ -94,9 +100,9 @@ If you would like to hack on MUI Toolpad or want to run the latest version, you
 
 1. Review/merge the PR — once the PR is merged to `master` a Docker image is built for the commit, tagged with the commit SHA and then pushed to Docker Hub, just like for any other commit in `master`.
 
-1. Wait for the Docker build to finish.
+1. Wait for the Docker build to finish. (You can find a job [here](https://app.circleci.com/pipelines/github/mui/mui-toolpad?branch=master))
 
-1. Release the Docker image using:
+1. Release the Docker image using (requires Github authentication token):
 
    ```sh
    # add --prerelease if necessary
@@ -105,4 +111,16 @@ If you would like to hack on MUI Toolpad or want to run the latest version, you
 
    This command runs a Github action that retags the Docker image of the release commit in `master` to the version being released and also to "latest", and pushes those new tags. During the release, no new Docker images are created.
 
-1. [Create a new Github release](https://docs.github.com/en/repositories/releasing-projects-on-github). Use `<version number>` as the tag and `<commit of merged PR>` as the target. Use the cleaned changelog as the body and the `<version number>` as the title. Mark as prerelease if necessary.
+1. [Create a new Github release](https://github.com/mui/mui-toolpad/releases/new).
+
+   1. Use `<version number>` to **Choose a tag** (when you enter new version GH UI will pop a suggestion `Create new tag: *** on publish`)
+
+   1. Use `<commit of merged PR>` as the **target**
+
+   1. Use the cleaned changelog as the content of **Describe this release**
+
+   1. Use `<version number>` as the **Release title**
+
+   1. Mark as prerelease if necessary.
+
+   1. **Publish release**