Add pure SSH LFS support (#31516)

Fixes #17554
/claim #17554

Docs PR https://gitea.com/gitea/docs/pulls/49

To test, run pushes like: `GIT_TRACE=1` git push. The trace output
should mention "pure SSH connection".

assets/go-licenses.json

@@ -344,6 +344,11 @@
 

	
	
	Internal Server Error - MokoGitea
	
	
	




	
		
			
				
					
						
					
				
				
					
				
			
		
		
		
			
				
				
					500 Internal Server Error
					
					
						Gitea Version: 1.26.1+244-ga8a01ed978
						
					
				
			
		
	

	
	
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