Added fail2ban, though not sure its configured correctly yet

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

@@ -0,0 +1,66 @@
+## Version 2022/08/06
+# Fail2Ban configuration file
+#
+# Author: Cyril Jaquier
+#
+#
+
+[Definition]
+
+# bypass ban/unban for restored tickets
+norestored = 1
+
+# Option:  actionstart
+# Notes.:  command executed on demand at the first ban (or at the start of Fail2Ban if actionstart_on_demand is set to false).
+# Values:  CMD
+#
+actionstart = printf %%b "Hi,\n
+              The jail <name> has been started successfully.\n
+              Regards,\n
+              Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: started  on <fq-hostname>" <dest>
+
+# Option:  actionstop
+# Notes.:  command executed at the stop of jail (or at the end of Fail2Ban)
+# Values:  CMD
+#
+actionstop = printf %%b "Hi,\n
+             The jail <name> has been stopped.\n
+             Regards,\n
+             Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: stopped on <fq-hostname>" <dest>
+
+# Option:  actioncheck
+# Notes.:  command executed once before each actionban command
+# Values:  CMD
+#
+actioncheck = 
+
+# Option:  actionban
+# Notes.:  command executed when banning an IP. Take care that the
+#          command is executed with Fail2Ban user rights.
+# Tags:    See jail.conf(5) man page
+# Values:  CMD
+#
+actionban = printf %%b "Hi,\n
+            The IP <ip> has just been banned by Fail2Ban after
+            <failures> attempts against <name>.\n
+            Regards,\n
+            Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: banned <ip> from <fq-hostname>" <dest>
+
+# Option:  actionunban
+# Notes.:  command executed when unbanning an IP. Take care that the
+#          command is executed with Fail2Ban user rights.
+# Tags:    See jail.conf(5) man page
+# Values:  CMD
+#
+actionunban = 
+
+[Init]
+
+# Default name of the chain
+#
+name = default
+
+# Destination/Addressee of the mail
+#
+dest = root
+