test(ci): only install headless shell chromium for playwright

[max-nextcloud]

Speeds up the installation of the browsers drastically:

scenario	1st run	2nd run	3rd run	avg
all browsers	53 sec	74 sec	59 sec	~ 62 sec
only chromium --with-deps	42 sec	29 sec	31 sec	~ 34 sec
chromium --with-deps --only-shell	22 sec	18 sec		~ 20 sec
chromium --only-shell	4 sec	5 sec		~ 4.5 sec

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.40%. Comparing base (929a649) to head (b9d7c35).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #2544   +/-   ##
=========================================
  Coverage     43.40%   43.40%           
  Complexity      882      882           
=========================================
  Files            77       77           
  Lines          3359     3359           
=========================================
  Hits           1458     1458           
  Misses         1901     1901           

[susnux]

I would like to revert this. Speed is no metric here but coverage.

We had many regressions in Safari and co meaning browser specific. So we should test all different browsers.
Also this is just seconds we are talking about.

[Chartman123]

Ok for me. :) or are there any other improvements on the performance possible that include the use of other browsers?

[max-nextcloud]

@susnux Even before this PR we the test were only run with chromium as that's the only browser defined in https://github.com/nextcloud/forms/blob/main/playwright.config.ts#L40-L46

I don't think Safari was installed before this PR either. My understanding is that it was firefox, webkit, chromium and headless chromium - of which only the latter was actually used.

[susnux]

@max-nextcloud sorry wrong project 🙈 I was somehow thinking we test Safari but that nc-vue not forms where we test Safari.