Help/Source code updates don't trigger rebuilds

[briantoby]

The files in GSASII/help are copied to https://advancedphotonsource.github.io/GSAS-II-tutorials/help by the [builddocsite.yml workflow.] (https://github.com/AdvancedPhotonSource/GSAS-II-tutorials/blob/main/.github/workflows/builddocsite.yml) where they can be available to users online as well as distributed with the code. An update to the GSASII/help .html files should a rebuild of the GSAS-II web site.

Likewise, when changes are made to the source code files the meson build could be triggered.

[briantoby]

Note that as a prototype, the TriggerRemote.yml workflow has been set up to run a workflow. This also requires setting up a token, as described here: https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/managing-your-personal-access-tokens

Note to trigger on the change for only one directory use

on:
  push:
    paths:
      - folder1/**