feat: implement flysystem

[praswicaksono]

Q	A
Branch	master
Bugfix?	no
New feature?	yes
Deprecation?	yes
Tickets?	fix #1929

This PR will bump php to 8.0 in order to support flysystem v3

The approach are to mount every directory that available in filemanager and file-edit

• Migrate FilemanagerController using FilesystemManager
• Migrate FileEditController using FilesystemManager
• Migrate ImageController using FilesystemManager

[praswicaksono]

need to bump this in order to install flysystem v3

[markkasaboski]

@bobdenotter @praswicaksono What happened to this PR?

Ah, I see. Bob has passed https://twokings.nl/. I'm sure this probably happened a while ago, but only just recently found Bolt, so I'm just finding out now.

[bobvandevijver]

@praswicaksono Would you be open to update this PR for the latest Bolt version?

[praswicaksono]

@bobvandevijver but I think we need to focus to upgrade symfony to LTS version first

[bobvandevijver]

Well, strictly speaking we are already using the Symfony LTS that currently has the longest support. Regarding the PHP version see #3538 and vote 😃

[github-actions]

In an effort to keep our pull request list manageable, we are marking this PR as stale because it has been 60 days without activity. If this PR is still relevant, please let us know by posting a quick comment or update so that it can be assigned and hopefully merged.