bicep: add git-mirroring service

packages/cgit.nix

@@ -0,0 +1,21 @@
+{ cgit, fetchurl, ... }:
+let
+  pname = cgit.pname;
+  commit = "09d24d7cd0b7e85633f2f43808b12871bb209d69";
+in
+cgit.overrideAttrs (_: {
+  version = "1.2.3-unstable-2024.07.16";
+
+  src = fetchurl {
+    url = "https://git.zx2c4.com/cgit/snapshot/${pname}-${commit}.tar.xz";
+    hash = "sha256-gfgjAXnWRqVCP+4cmYOVdB/3OFOLJl2WBOc3bFVDsjw=";
+  };
+
+  # cgit is tightly coupled with git and needs a git source tree to build.
+  # IMPORTANT: Remember to check which git version cgit needs on every version
+  # bump (look for "GIT_VER" in the top-level Makefile).
+  gitSrc = fetchurl {
+    url = "mirror://kernel/software/scm/git/git-2.46.0.tar.xz";
+    hash = "sha256-fxI0YqKLfKPr4mB0hfcWhVTCsQ38FVx+xGMAZmrCf5U=";
+  };
+})