Fix file permission for pubKey Auth

[maddingo]

fix permissions on authorized_keys, exclude some old versions for pubkey auth, due to missing support for encryption alg
This should fix #70

All unit tests with pubkey Auth fail on my machine, strange that the build on github succeeds

May it is easier to remove support for the older image versions

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (38d703a) 89.67% compared to head (f8fd99a) 88.81%.

Files	Patch %	Lines
...containers/gitserver/plain/GitServerContainer.java	66.66%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #71      +/-   ##
============================================
- Coverage     89.67%   88.81%   -0.86%     
- Complexity       48       49       +1     
============================================
  Files             7        7              
  Lines           155      161       +6     
  Branches          7        7              
============================================
+ Hits            139      143       +4     
- Misses           15       17       +2     
  Partials          1        1              

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[sparsick]

Thanks for the fix. I will release a new version.