test(nextcloud): Reuse container for cookbook tests

[provokateurin]

Preparation for #1901

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 30.97%. Comparing base (85c8071) to head (6e5d642).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2292      +/-   ##
==========================================
+ Coverage   30.92%   30.97%   +0.04%     
==========================================
  Files         265      265              
  Lines       96710    96710              
==========================================
+ Hits        29907    29955      +48     
+ Misses      66803    66755      -48     

Flag	Coverage Δ		*Carryforward flag
cookie_store	90.51% <ø> (ø)		Carriedforward from 85c8071
dynamite	31.10% <ø> (ø)		Carriedforward from 85c8071
dynamite_end_to_end_test	60.03% <ø> (ø)		Carriedforward from 85c8071
dynamite_runtime	85.40% <ø> (ø)		Carriedforward from 85c8071
neon_dashboard	96.20% <ø> (ø)
neon_framework	45.90% <ø> (ø)
neon_notifications	100.00% <ø> (ø)
neon_talk	98.18% <ø> (ø)
nextcloud	27.72% <ø> (+0.05%)	⬆️
sort_box	90.90% <ø> (ø)		Carriedforward from 85c8071

*This pull request uses carry forward flags. Click here to find out more.

see 1 file with indirect coverage changes