add TPOT_PERSISTENCE_CYCLES setting

- makes logrotate cycles configurable, instead of static 30 days
- adjust .env / env.example for setting cycles
- adjust tpotinit dockerfile to include envsubst
- add logrotate.template
- add checks / validations

env.example

@@ -40,6 +40,14 @@ TPOT_BLACKHOLE=DISABLED
 #       if you just do not need any of the logfiles.
 TPOT_PERSISTENCE=on
 
+# T-Pot Persistence Cycles
+#  <1-999>: Set the number of T-Pot restart cycles for logrotate.
+#           Be mindful of this setting as the logs will use up a lot of available disk space.
+#           In case the setting is invalid, T-Pot will default to 30 cycles.
+#  Remember to adjust the Elastic Search Lifecycle Policy (https://github.com/telekom-security/tpotce/?tab=readme-ov-file#log-persistence) 
+#  as this setting only accounts for the honeypot logs in the ~/tpotce/data folder.
+TPOT_PERSISTENCE_CYCLES=30
+
 # T-Pot Type
 #  HIVE: This is the default and offers everything to connect T-Pot sensors.
 #  SENSOR: This needs to be used when running a sensor. Be aware to adjust all other