Add support for Forgejo

[sparsick]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.14%. Comparing base (e464834) to head (47d901c).

Files with missing lines	Patch %	Lines
...containers/gitserver/forgejo/ForgejoContainer.java	84.37%	9 Missing and 1 partial ⚠️
.../testcontainers/gitserver/forgejo/SshIdentity.java	90.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #259      +/-   ##
============================================
- Coverage     90.76%   89.14%   -1.62%     
- Complexity       55       72      +17     
============================================
  Files             8       10       +2     
  Lines           184      258      +74     
  Branches          7        8       +1     
============================================
+ Hits            167      230      +63     
- Misses           16       26      +10     
- Partials          1        2       +1     

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