Update environment.md

Author: MichaelCurrin

cheatsheets/jekyll/environment.md

@@ -3,14 +3,40 @@
 
 {% raw %}
 
+## Production builds
+
+Some plugins or includes blocks as around Jekyll Analytics will only run when using prod env - locally or through GH Pages.
+
+GH Pages will set this as production value for you when it builds.
+
 ```sh
 JEKYLL_ENV=production bundle exec jekyll build
 ```
 
+Example use:
+
 ```liquid
 {% if jekyll.environment == 'production' and site.google_analytics %}
     {% include google-analytics.html %}
 {% endif %}
 ```
 
+
+## GitHub metadata
+
+When using the GitHub Metadata plugin to get data for your GH profile and repos, you will this error when doing a prod build locally, outside of GH Pages. Even if your remote is set, which is what is requests:
+
+```
+Liquid Exception: No repo name found. Specify using PAGES_REPO_NWO environment variables, 'repository' in your configuration, or set up an 'origin' git remote pointing to your github.com repository.
+```
+
+You can solve this by setting your "NWO" (name with owner) in your config file.
+
+```yaml
+repository: username/repo-name
+```
+
+See [Configuration](https://jekyll.github.io/github-metadata/configuration/) help page for the GH Metadata plugin.
+
+
 {% endraw %}