When activating the current 0.3.0 plugin an error message is displayed.
Warning: file_get_contents(/code/wp-content/plugins/pantheon-wordpress-edge-integrations-0.3.0/pantheon-wordpress-edge-integrations-0.3.0.php): failed to open stream: No such file or directory in /code/wp-includes/functions.php on line 6620
We discovered that it is looking for the plugin file with the ending "-0.3.0.php" but the actual plugin file is "pantheon-wordpress-edge-integrations.php." Renaming the file fixed the issue and the plugin activates correctly now.
Make sure that the vendor folder is added in the repo, if not, you will need to add this at the end of the line of your main .gitignore file: !wp-content/plugins/pantheon-wordpress-edge-integrations-main/vendor
Git add, commit then push the changes to you Pantheon repo