Update git config with commit signing

home-manager/git/default.nix

@@ -31,6 +31,14 @@
           user = {
             email = "git@noahknegt.com";
           };
+
+          commit = {
+            gpgSign = true;
+          };
+
+          tag = {
+            gpgSign = true;
+          };
         };
       }
       {
@@ -38,6 +46,15 @@
         contents = {
           user = {
             email = "git@noahknegt.com";
+            signingKey = "~/.ssh/id_open_source.pub";
+          };
+
+          commit = {
+            gpgSign = true;
+          };
+
+          tag = {
+            gpgSign = true;
           };
         };
       }