let fulltest and coverage can be triggered manually

[dannypsnl]

As title, add

# allow you to run this workflow manually from tab
workflow_dispatch:

into fulltest.yml and coverage.yml.

[mewmew]

Sound good, feel free to submit a commit.

Edit:

However, lets first handle 3d1eaf3#comments and potentially force reset the master branch 2 commits back, before adding this.

This is now done, so feel free to submit the changes for the CI.