fix(sourcehut): actually environment.variables do not affect systemd services, trying another way

nixos/sourcehut.nix

@@ -3,6 +3,13 @@ let
   sourcehut-fqdn = "sourcehut.nixos.local";
 in
 {
+  systemd.services.gitsrht = {
+    environment = {
+      # make python's requests package use the global ca-certificates store, which will contain my own CA cert
+      REQUESTS_CA_BUNDLE = "/etc/ssl/certs/ca-certificates.crt";
+    };
+  };
+
   # enable selfhosted sourcehut instance
   services.sourcehut = {
     enable = true;