github-ci: add workflow_dispatch

[jasonish]

A workflow dispatch allows us to manually a trigger a workflow with
arguments. This dispatch allows us to use the "gh" cli command to
trigger a workflow run with our libhtp/su/sv branch and repo variables
set. For example:

gh run builds.yml -f SV_REPO=jasonish/suricata-verify -f SV_BRANCH=pr/10

[codecov]

Codecov Report

Merging #8878 (d1c6b66) into master (ebe0a7b) will increase coverage by 0.00%.
The diff coverage is n/a.

❗ Current head d1c6b66 differs from pull request most recent head d6cf757. Consider uploading reports for the commit d6cf757 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8878   +/-   ##
=======================================
  Coverage   82.30%   82.30%           
=======================================
  Files         969      969           
  Lines      273335   273240   -95     
=======================================
- Hits       224961   224902   -59     
+ Misses      48374    48338   -36     

Flag	Coverage Δ
fuzzcorpus	64.61% <ø> (-0.04%)	⬇️
suricata-verify	60.38% <ø> (-0.07%)	⬇️
unittests	62.95% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

[catenacyber]

Looks good to me, how did you test it ?

[jasonish]

Looks good to me, how did you test it ?

Push it to my own master then running something like:

gh -R jasonish/suricata workflow run builds.yml -f SV_REPO=jasonish/suricata-verify -f SV_BRANCH=pr-staging/1

[catenacyber]

Could you rebase, so that I approve again, to see if firing CODEOWNERS fixed the approved PR filter ?

[jasonish]

Could you rebase, so that I approve again, to see if firing CODEOWNERS fixed the approved PR filter ?

Done.

[catenacyber]

Rebase is good

[victorjulien]

Merged in #8951, thanks!