Create a temp certfile

[rullzer]

Hopefully fixes or at leasts gives some more insights into #3470

@LukasReschke as discussed...

More debugging later.

[mention-bot]

@rullzer, thanks for your PR! By analyzing the history of the files in this pull request, we identified @icewind1991, @LukasReschke and @schiessle to be potential reviewers.

[MorrisJobke]

I guess this should not be in here 😉

[icewind1991]

@rullzer ping

[codecov]

Codecov Report

Merging #4984 into master will decrease coverage by 46.34%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master   #4984       +/-   ##
============================================
- Coverage     53.76%   7.42%   -46.35%     
+ Complexity    22747   22274      -473     
============================================
  Files          1405    1379       -26     
  Lines         86879   84649     -2230     
  Branches       1328    1322        -6     
============================================
- Hits          46713    6284    -40429     
- Misses        40166   78365    +38199

Impacted Files	Coverage Δ	Complexity Δ
lib/private/App/AppStore/Fetcher/Fetcher.php	0% <ø> (-77.95%)	19 <0> (ø)
lib/private/Security/CertificateManager.php	0% <0%> (-91.84%)	38 <0> (-1)
lib/private/Security/IdentityProof/Key.php	0% <0%> (-100%)	3% <0%> (ø)
lib/private/Files/Storage/Temporary.php	0% <0%> (-100%)	4% <0%> (ø)
lib/private/App/AppStore/Bundles/Bundle.php	0% <0%> (-100%)	2% <0%> (ø)
apps/files/lib/Activity/Settings/FileRestored.php	0% <0%> (-100%)	8% <0%> (ø)
lib/private/Notification/Action.php	0% <0%> (-100%)	24% <0%> (ø)
...rivate/Authentication/Token/DefaultTokenMapper.php	0% <0%> (-100%)	11% <0%> (ø)
lib/private/Files/ObjectStore/Mapper.php	0% <0%> (-100%)	2% <0%> (ø)
lib/private/Repair/NC11/FixMountStorages.php	0% <0%> (-100%)	5% <0%> (ø)
... and 928 more

[codecov-io]

Codecov Report

Merging #4984 into master will decrease coverage by 22.96%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master   #4984       +/-   ##
============================================
- Coverage     53.76%   30.8%   -22.97%     
+ Complexity    22747   22746        -1     
============================================
  Files          1405    1405               
  Lines         86879   86282      -597     
  Branches       1328    1328               
============================================
- Hits          46713   26581    -20132     
- Misses        40166   59701    +19535

Impacted Files	Coverage Δ	Complexity Δ
lib/private/Security/CertificateManager.php	0% <0%> (-91.84%)	39 <1> (ø)
lib/private/Server.php	26.56% <0%> (-66.8%)	120 <0> (ø)
lib/private/DB/OCSqlitePlatform.php	0% <0%> (-100%)	5% <0%> (ø)
...s/dav/lib/Connector/Sabre/Exception/FileLocked.php	0% <0%> (-100%)	3% <0%> (ø)
apps/dav/lib/Connector/Sabre/Server.php	0% <0%> (-100%)	1% <0%> (ø)
...s/federatedfilesharing/lib/AppInfo/Application.php	0% <0%> (-100%)	5% <0%> (ø)
...ivate/Files/Cache/Wrapper/CachePermissionsMask.php	0% <0%> (-100%)	3% <0%> (ø)
apps/files_sharing/lib/AppInfo/Application.php	0% <0%> (-100%)	3% <0%> (-1%)
apps/dav/lib/CalDAV/PublicCalendarRoot.php	0% <0%> (-100%)	4% <0%> (ø)
apps/user_ldap/lib/Migration/UUIDFixGroup.php	0% <0%> (-100%)	1% <0%> (ø)
... and 375 more

[rullzer]

Ok... I just tried certfile regeneration 30 times on a host that had the issues... all worked... so lets pray it now works good enough...

Should backport to stable12

@LukasReschke @MorrisJobke @nickvergessen @icewind1991 please review