Set Git timeouts

In an attempt to avoid Git operations hanging.

guix-data-service/poll-git-repository.scm

@@ -25,6 +25,7 @@
   #:use-module (knots)
   #:use-module ((knots thread-pool) #:select (set-thread-name))
   #:use-module (git)
+  #:use-module (git settings)
   #:use-module (guix git)
   #:use-module (guix channels)
   #:use-module (guix-data-service database)
@@ -45,6 +46,10 @@
        (const #t))
 
      (libgit2-init!)
+
+     (set-server-connection-timeout! 60000)
+     (set-server-timeout! 60000)
+
      (honor-system-x509-certificates!)
 
      (with-postgresql-connection