Add GleSYS DNS plugin

[Peglah]

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

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Description:

This change adds the certbot-dns-glesys python module to the container, allowing for certbot dns verification to be done using the GleSYS DNS API.

Benefits of this PR and context:

This change provides an additional DNS verification mechanism, meaning that users of GleSYS are able to use DNS verification for certbot on the SWAG instances.

How Has This Been Tested?

I have tested this change by building the project locally and running one of my swag instances with the updates docker image and GleSYS DNS configuration. The swag instance was successfully able to generate new certbot certificates (covering 1 sub domains) using GleSYS DNS.

Source / References:

docker-swag.log

[github-actions]

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[LinuxServer-CI]

I am a bot, here are the test results for this PR:
https://ci-tests.linuxserver.io/lspipepr/swag/2.7.4-pkg-f440af71-dev-278b57fb4785ce44fbba6ab841342e4920132711-pr-425/index.html
https://ci-tests.linuxserver.io/lspipepr/swag/2.7.4-pkg-f440af71-dev-278b57fb4785ce44fbba6ab841342e4920132711-pr-425/shellcheck-result.xml

Tag	Passed
amd64-2.7.4-pkg-f440af71-dev-278b57fb4785ce44fbba6ab841342e4920132711-pr-425	✅
arm64v8-2.7.4-pkg-f440af71-dev-278b57fb4785ce44fbba6ab841342e4920132711-pr-425	✅

[nemchik]

This addition will depend on the outcome of #422

[LinuxServer-CI]

This pull request has been automatically marked as stale because it has not had recent activity. This might be due to missing feedback from OP. It will be closed if no further activity occurs. Thank you for your contributions.

[brother]

I consider it active still. We’re waiting on the linked issue.

[Peglah]

Since #422 now is closed I tried to rebase this PR. I'm still learning git however...
Anyway, I tried the rebased code and it still works as expected. Here is a log.

[LinuxServer-CI]

I am a bot, here are the test results for this PR:
https://ci-tests.linuxserver.io/lspipepr/swag/2.8.0-pkg-6d4768cc-dev-9693b5884fbdbc2936d6ab475e19d7c5bfd8d53a-pr-425/index.html
https://ci-tests.linuxserver.io/lspipepr/swag/2.8.0-pkg-6d4768cc-dev-9693b5884fbdbc2936d6ab475e19d7c5bfd8d53a-pr-425/shellcheck-result.xml

Tag	Passed
amd64-2.8.0-pkg-6d4768cc-dev-9693b5884fbdbc2936d6ab475e19d7c5bfd8d53a-pr-425	✅
arm64v8-2.8.0-pkg-6d4768cc-dev-9693b5884fbdbc2936d6ab475e19d7c5bfd8d53a-pr-425	✅

[nemchik]

LGTM, thanks

Note for team visibility: I compared the package versions from the PR to master and nothing is downgrading.