Added fail2ban, though not sure its configured correctly yet

docker/rootfs/fail2ban/action.d/ufw.conf

@@ -0,0 +1,76 @@
+## Version 2022/08/06
+# Fail2Ban action configuration file for ufw
+#
+# You are required to run "ufw enable" before this will have any effect.
+#
+# The insert position should be appropriate to block the required traffic.
+# A number after an allow rule to the application won't be of much use.
+
+[Definition]
+
+actionstart = 
+
+actionstop = 
+
+actioncheck = 
+
+# ufw does "quickly process packets for which we already have a connection" in before.rules,
+# therefore all related sockets should be closed
+# actionban is using `ss` to do so, this only handles IPv4 and IPv6.
+
+actionban = if [ -n "<application>" ] && ufw app info "<application>"
+            then
+              ufw <add> <blocktype> from <ip> to <destination> app "<application>" comment "<comment>"
+            else
+              ufw <add> <blocktype> from <ip> to <destination> comment "<comment>"
+            fi
+            <kill>
+
+actionunban = if [ -n "<application>" ] && ufw app info "<application>"
+              then
+                ufw delete <blocktype> from <ip> to <destination> app "<application>"
+              else
+                ufw delete <blocktype> from <ip> to <destination>
+              fi
+
+# Option: kill-mode
+# Notes.: can be set to ss or conntrack (may be extended later with other modes) to immediately drop all connections from banned IP, default empty (no kill)
+# Example: banaction = ufw[kill-mode=ss]
+kill-mode =
+
+# intern conditional parameter used to provide killing mode after ban:
+_kill_ =
+_kill_ss = ss -K dst "[<ip>]"
+_kill_conntrack = conntrack -D -s "<ip>"
+
+# Option: kill
+# Notes.: can be used to specify custom killing feature, by default depending on option kill-mode
+# Examples: banaction = ufw[kill='ss -K "( sport = :http || sport = :https )" dst "[<ip>]"']
+#           banaction = ufw[kill='cutter "<ip>"']
+kill = <_kill_<kill-mode>>
+
+[Init]
+# Option: add
+# Notes.: can be set to "insert 1" to insert a rule at certain position (here 1):
+add = prepend
+
+# Option: blocktype
+# Notes.: reject or deny
+blocktype = reject
+
+# Option: destination
+# Notes.: The destination address to block in the ufw rule
+destination = any
+
+# Option: application
+# Notes.: application from sudo ufw app list
+application = 
+
+# Option: comment
+# Notes.: comment for rule added by fail2ban
+comment = by Fail2Ban after <failures> attempts against <name>
+
+# DEV NOTES:
+# 
+# Author: Guilhem Lettron
+# Enhancements: Daniel Black