unconditionally restart trigger services on liminix-rebuild

We call s6-rc -u -p default to restart/start the base services
on a rebuild, otherwise services that are only in the new
configuration won't come up. However, this stops any service
started by a trigger. So, workaround is to restart the trigger
service and expect it to restart the services it manages if they're
needed

pkgs/liminix-tools/services/builder.sh

@@ -11,7 +11,7 @@ test -n "$contents" && for d in $contents; do
     touch $out/${name}/contents.d/$d
 done
 
-for i in timeout-up timeout-down run notification-fd up down consumer-for producer-for pipeline-name ; do
+for i in timeout-up timeout-down run notification-fd up down consumer-for producer-for pipeline-name restart-on-upgrade; do
     test -n "$(printenv $i)" && (echo "$(printenv $i)" > $out/${name}/$i)
 done
 

pkgs/liminix-tools/services/default.nix

@@ -36,12 +36,14 @@ let
     , dependencies ? []
     , contents ? []
     , buildInputs ? []
+    , isTrigger ? false
   } @ args:
     stdenvNoCC.mkDerivation {
       # we use stdenvNoCC to avoid generating derivations with names
       # like foo.service-mips-linux-musl
       inherit name serviceType up down run notification-fd
         producer-for consumer-for pipeline-name timeout-up timeout-down;
+      restart-on-upgrade = isTrigger;
       buildInputs = buildInputs ++ dependencies ++ contents;
       dependencies = builtins.map (d: d.name) dependencies;
       contents = builtins.map (d: d.name) contents;