Add Fail2Ban

[jeremy-code]

• https://github.com/crazy-max/docker-fail2ban
• https://github.com/linuxserver/docker-fail2ban

[jeremy-code]

• https://registry.terraform.io/providers/cloudflare/cloudflare/latest/docs/resources/zero_trust_gateway_certificate
• https://github.com/dani-garcia/vaultwarden/wiki/Fail2Ban-Setup
• https://niksec.com/using-fail2ban-with-cloudflare/
• https://registry.terraform.io/providers/cloudflare/cloudflare/latest/docs/resources/zero_trust_list
• https://registry.terraform.io/providers/cloudflare/cloudflare/latest/docs/resources/zero_trust_gateway_policy
• https://developers.cloudflare.com/cloudflare-one/team-and-resources/devices/user-side-certificates/manual-deployment/#4-add-the-certificate-to-operating-systems

[jeremy-code]

• https://github.com/fail2ban/fail2ban/blob/333f1056757f4663446ad773121c0bc8dfff9af2/config/action.d/smtp.py#L26
• https://kovasky.me/blogs/cloudflare_fail2ban/
• https://developers.cloudflare.com/waf/tools/lists/
• https://developers.cloudflare.com/waf/tools/lists/custom-lists/