nixos/pretalx: run pretalx-manage migrate on plugin changes and upgrades (#450102)

nixos/modules/services/web-apps/pretalx.nix

@@ -439,14 +439,21 @@ in
             "mysql.service"
           ];
           wantedBy = [ "multi-user.target" ];
-          preStart = ''
+          preStart =
+            let
+              versionString = lib.concatStringsSep "\n" (
+                [ "pretalx-${cfg.package.version}" ]
+                ++ map (plugin: "${plugin.pname}-${plugin.version}") cfg.plugins
+              );
+            in
+            ''
               versionFile="${cfg.settings.filesystem.data}/.version"
-            version=$(cat "$versionFile" 2>/dev/null || echo 0)
+              version="$(cat "$versionFile" 2>/dev/null || echo 0)"
 
-            if [[ $version != ${cfg.package.version} ]]; then
+              if [[ "$version" != "${versionString}" ]]; then
                 ${lib.getExe' pythonEnv "pretalx-manage"} migrate
 
-              echo "${cfg.package.version}" > "$versionFile"
+                echo "${versionString}" > "$versionFile"
               fi
             '';
           serviceConfig = {