add "gh-actions" as clickable node filter

[megies]

No hurry at all, but might be good to have gh-actions as clickable node filter since we likely switch all CI over to there see obspy/obspy#2591 Didn't see it in the source code here, so I'm guessing it's in the database?

[megies]

Maybe also move the nodes to before Python versions, since that list is really long and you can only see the node filter by scrolling way down.

Another good thing would be a tiny hint at other filtering options.. (maybe just a short one-liner below the big "Test reports ..." heading

• pr=...
• module=...
• git=

https://github.com/obspy/reporter/blob/af98fe756615fe888a0ba25867e7a97017e1dcf4/src/reporter/core/views.py#L148

[barsch]

all implemented

[megies]

:rocket: :tada: