Add FrankenPHP support

[jaydrogers]

Franken PHP

🚀 What this PR does

• [x] Adds FrankenPHP be offered as a variation
• [ ] Allow the PHP minor version to be selected with FrankenPHP
• [ ] Allow the "autorun" scripts and other custom init scripts to run before bringing up FrankenPHP
• [ ] Allow the PHP_ environment variables from other Server Side Up images to work with FrankenPHP

Create documentation

• [ ] Laravel + FrankenPHP
• [ ] Customizing start up with FrankenPHP
• [ ] Installing custom PHP extensions with FrankenPHP

Checklist

• [ ] Ensure SSL_MODE works as other variations
• [ ] Ensure custom extensions can be installed like other variations

[Sammyjo20]

This would be super cool to have! Great work on this so far!

[cloudflare-workers-and-pages[bot]]

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View logs

[GunniBusch]

This would really be a nice addition..

[thinkstylestudio]

This will be a wonderful addition!

[mihai-burduselu-ptt]

This would be a great feature! 🚀 Any updates here?

[jaydrogers]

Not sure how I missed your message @mihai-burduselu-ptt.

I am getting v3.4 updates out the door for the last major optimizations for fpm-nginx. Then it's FrankenPHP time 😎