It seems that next-sitemap is unable to produce sitemaps for dynamic paths, so we're switching back to dynamic server-side sitemap generation

src/shared/data/groups.json

@@ -0,0 +1,4 @@
+{
+  "ps7": [146, "ПС-7"],
+  "pks35k": [78, "ПКС-35к"]
+}

src/shared/data/groups.ts

@@ -1,4 +0,0 @@
-export const groups: { [group: string]: [number, string] } = {
-  ps7: [146, 'ПС-7'],
-  pks35k: [78, 'ПКС-35к']
-}