[FEAT] Add subversion client to enable SVN extension/functionality

[smartylm]

Is this a new feature request?

• I have searched the existing issues

Wanted change

Add svn client to the image

Reason for change

Enable using subversion (via extensions) with version control

Proposed code change

Add the following line to Dockerfile
apt-get install -y subversion

[github-actions]

Thanks for opening your first issue here! Be sure to follow the relevant issue templates, or risk having this issue marked as invalid.

[j0nnymoe]

Don't need us to add it, you can use this: https://github.com/linuxserver/docker-mods/tree/universal-package-install

[smartylm]

Don't need us to add it, you can use this: https://github.com/linuxserver/docker-mods/tree/universal-package-install

Perfect. Thank you.