flake.nix: Add attic-static

flake.nix

@@ -40,6 +40,25 @@
 
       attic-nixpkgs = pkgs.callPackage ./package.nix { };
 
+      # TODO: Make this work with Crane
+      attic-static = (pkgs.pkgsStatic.callPackage ./package.nix {
+        nix = pkgs.pkgsStatic.nix.overrideAttrs (old: {
+          patches = (old.patches or []) ++ [
+            # To be submitted
+            (pkgs.fetchpatch {
+              url = "https://github.com/NixOS/nix/compare/3172c51baff5c81362fcdafa2e28773c2949c660...6b09a02536d5946458b537dfc36b7d268c9ce823.diff";
+              hash = "sha256-LFLq++J2XitEWQ0o57ihuuUlYk2PgUr11h7mMMAEe3c=";
+            })
+          ];
+        });
+      }).overrideAttrs (old: {
+        # Read by pkg_config crate (do some autodetection in build.rs?)
+        PKG_CONFIG_ALL_STATIC = "1";
+
+        "NIX_CFLAGS_LINK_${pkgs.pkgsStatic.stdenv.cc.suffixSalt}" = "-lc";
+        RUSTFLAGS = "-C relocation-model=static";
+      });
+
       attic-ci-installer = pkgs.callPackage ./ci-installer.nix {
         inherit self;
       };