Added iptables-legacy to installed packages

[dustinwilson]

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• [x ] I have read the contributing guideline and understand that I have made the correct modifications

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Description:

The recent rebase to Alpine 3.19 broke the functionality on hosts which use iptables such as Unraid. This PR also installs the Alpine package iptables-legacy so that users on these systems may still use the container. This PR fixes #25.

Benefits of this PR and context:

The container is unusable on hosts which only have iptables. With this PR it will remain usable.

How Has This Been Tested?

Installed a container on two computers, one which is an Unraid system and another an Arch linux system. The Unraid one uses iptables while the Arch one uses nftables. I configured fail2ban to monitor ssh on each, and an entry was added to the tables for ssh as expected. After multiple test unsuccessful attempts it blocked me afterwards. @danielaranki performed a similar test last week and showed his findings in #25.

The user will need to specify in their jail.local file which backend to use (also pointed out by @danielaranki in #25):

banaction = iptables-multiport[iptables=iptables-legacy]

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[danielaranki]

This provides a resolution to #25.

If this PR gets merged, it is recommended that the documentation in https://github.com/linuxserver/fail2ban-confs be updated to advise users to the availability of both iptables backends and how to choose between them in conf files. I'm happy to open an issue and subsequently a PR there once (and if) this PR gets merged.

[LinuxServer-CI]

I am a bot, here are the test results for this PR:
https://ci-tests.linuxserver.io/lspipepr/fail2ban/1.0.2-r3-pkg-a4dab79a-dev-7c79365b68862a9114204d7fbd1ec6824b26579b-pr-26/index.html
https://ci-tests.linuxserver.io/lspipepr/fail2ban/1.0.2-r3-pkg-a4dab79a-dev-7c79365b68862a9114204d7fbd1ec6824b26579b-pr-26/shellcheck-result.xml

Tag	Passed
amd64-1.0.2-r3-pkg-a4dab79a-dev-7c79365b68862a9114204d7fbd1ec6824b26579b-pr-26	✅
arm64v8-1.0.2-r3-pkg-a4dab79a-dev-7c79365b68862a9114204d7fbd1ec6824b26579b-pr-26	✅

[LinuxServer-CI]

I am a bot, here are the test results for this PR:
https://ci-tests.linuxserver.io/lspipepr/fail2ban/1.0.2-r3-pkg-70d76770-dev-330801d4feee2895657c0ca41c44af8d194f8495-pr-26/index.html
https://ci-tests.linuxserver.io/lspipepr/fail2ban/1.0.2-r3-pkg-70d76770-dev-330801d4feee2895657c0ca41c44af8d194f8495-pr-26/shellcheck-result.xml

Tag	Passed
amd64-1.0.2-r3-pkg-70d76770-dev-330801d4feee2895657c0ca41c44af8d194f8495-pr-26	✅
arm64v8-1.0.2-r3-pkg-70d76770-dev-330801d4feee2895657c0ca41c44af8d194f8495-pr-26	✅

[LinuxServer-CI]

I am a bot, here are the test results for this PR:
https://ci-tests.linuxserver.io/lspipepr/fail2ban/1.0.2-r3-pkg-07be558e-dev-f090218fe0452ffe14603afba9cff51dbc2dc906-pr-26/index.html
https://ci-tests.linuxserver.io/lspipepr/fail2ban/1.0.2-r3-pkg-07be558e-dev-f090218fe0452ffe14603afba9cff51dbc2dc906-pr-26/shellcheck-result.xml

Tag	Passed
amd64-1.0.2-r3-pkg-07be558e-dev-f090218fe0452ffe14603afba9cff51dbc2dc906-pr-26	✅
arm64v8-1.0.2-r3-pkg-07be558e-dev-f090218fe0452ffe14603afba9cff51dbc2dc906-pr-26	✅

[LinuxServer-CI]

I am a bot, here are the test results for this PR:
https://ci-tests.linuxserver.io/lspipepr/fail2ban/1.0.2-r3-pkg-baee7599-dev-d6bc2ba25e43e2c8c28a9ed7f1069d3c80cfc61a-pr-26/index.html
https://ci-tests.linuxserver.io/lspipepr/fail2ban/1.0.2-r3-pkg-baee7599-dev-d6bc2ba25e43e2c8c28a9ed7f1069d3c80cfc61a-pr-26/shellcheck-result.xml

Tag	Passed
amd64-1.0.2-r3-pkg-baee7599-dev-d6bc2ba25e43e2c8c28a9ed7f1069d3c80cfc61a-pr-26	✅
arm64v8-1.0.2-r3-pkg-baee7599-dev-d6bc2ba25e43e2c8c28a9ed7f1069d3c80cfc61a-pr-26	✅

[LinuxServer-CI]

I am a bot, here are the test results for this PR:
https://ci-tests.linuxserver.io/lspipepr/fail2ban/1.0.2-r3-pkg-56777ab5-dev-d40135ac81953cddac83d8019f7c2e38929257ba-pr-26/index.html
https://ci-tests.linuxserver.io/lspipepr/fail2ban/1.0.2-r3-pkg-56777ab5-dev-d40135ac81953cddac83d8019f7c2e38929257ba-pr-26/shellcheck-result.xml

Tag	Passed
amd64-1.0.2-r3-pkg-56777ab5-dev-d40135ac81953cddac83d8019f7c2e38929257ba-pr-26	✅
arm64v8-1.0.2-r3-pkg-56777ab5-dev-d40135ac81953cddac83d8019f7c2e38929257ba-pr-26	✅

[drizuid]

I see no reason to not add this in, we do this in swag for fail2ban also. once #29 is merged, this will need to be updated against that. Apologies for the delays on this, it slipped our notice, but at least you get some hacktoberfest credit for it now :)

[nemchik]

Shouldn't be an issue to merge this. I don't think it has any effect until the confs are changed. A previous comment mentioned updating the docs in the config repo as well.