fix automated builds

[bashbaug]

• Updates the GitHub actions to build from the proper branch for pull requests
• Includes the asciidoc fixes from Fix build failure for QCOM extensions #295 to fix the asciidoc build errors

[dgkoch]

Sees to work, so LGTM. I don't really understand which piece fixes it though.

[bashbaug]

I think it's due to the change from pull_request_target to pull_request. See:
https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows#pull_request_target

"This event runs in the context of the base of the pull request, rather than in the context of the merge commit, as the pull_request event does."

[dgkoch]

Ah - gotcha. That makes sense.

[Naghasan]

LGTM