out of interest - why do you need to fork any of the official plugins?
In any case in app.yml you can run a command to delete the specific plugin directory then clone your own if you absolutely need to, e.g.:
<in after_code: somewhere >
- exec:
cd: $home/plugins
cmd:
- rm -r poll
- exec:
cd: $home/plugins
cmd:
- git clone https://github.com/myaccount/myplugin-replacement.git
you might be able to do this, but check:
<in after_code: somewhere >
- exec:
cd: $home/plugins
cmd:
- rm -r poll
- git clone https://github.com/myaccount/myplugin-replacement.git
I haven’t been that careful with spaces - make sure indentation is perfect.