feat: add userbot k8s deployment method

- Kustomize: base + overlays/dev + overlays/prod

.env.example

@@ -0,0 +1,14 @@
+# apiflash api key only for webshot plugin
+APIFLASH_KEY=""
+# gemini api key only for gemini plugin
+GEMINI_KEY=""
+# VT api key only for VirusTotal plugin
+VT_KEY=""
+# rmbg api key only for removebg plugin
+RMBG_KEY=""
+# cohere api key only for cohere plugin
+COHERE_KEY=""
+# sqlite/sqlite3 or mongo/mongodb 
+DATABASE_TYPE=""
+# file name for sqlite3, database name for mongodb 
+DATABASE_NAME=""