[4.3] Add a CLI installation for Joomla

[Hackwar]

This PR adds a method to install Joomla via command line to simplify API tests and installations with one-click-setups. The new installation method can be triggered by running php installation/joomla.php install in the root of the Joomla folder. The different options are documented by running php installation/joomla.php help install.

All options can be given either by option directly on the command line or when running the install command interactively. If a default value is given for an option and that option is not defined, that default value is taken.

Summary of Changes

This adds a new CLI entry file, similar to cli/joomla.php to the installation with all necessary steps to run the installation. The code uses as much of the current installation as possible and validates the options from the setup.xml file.

Testing Instructions

1. Run php installation/joomla.php install in your installation and check that afterwards Joomla is properly installed.
2. Run php installation/joomla.php install with all necessary CLI options

If you are using a dev version (checked out the GIT version) the installation folder is preserved, otherwise the folder is deleted.

Documentation Changes Required

The CLI installation is documented here: https://docs.joomla.org/J4.x:Joomla_CLI_Installation as well as in installation/INSTALL.

Acknowledgement

I'd like to thank Mittwald for supporting this improvement.

[brianteeman]

excited to try this. would it not make more sense for it to be in the cli folder?

[Hackwar]

Unfortunately the application in the /cli folder does only work when Joomla is already installed. Since the installer should also be removed when the installation is done, it needs to be part of the /installation folder.

[brianteeman]

Unfortunately the application in the /cli folder does only work when Joomla is already installed. Since the installer should also be removed when the installation is done, it needs to be part of the /installation folder.

Fair enough

[Hackwar]

I removed the double error string. I just want to point out, that that is the error you get in the web installer when the credentials are wrong. So you are requesting different, stricter standards for the CLI installer than for the normal web installer. But whatever. Here you go, there is your fixed translation string. I also sorted the translation strings for the CLI file alphanumerically. Can we please merge this now?

BTW: Dieter Ziller was so kind to help with the documentation. See the link added to the first post in this PR.

[obuisard]

@Hackwar thank you for documenting the CLI installation process. Great job.

[HLeithner]

tested on php 7.2.16 with manual input and console parameter.

[HLeithner]

Thanks

[Hackwar]

Thank you!