nixos/wordpress: caddy support

[onny]

Motivation for this change

Adds caddy web server support to wordpress module which already supports httpd and nginx. Since most of the restructuring was already done by adding nginx support here, this PR is quite reasonable.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• 21.11 Release Notes (or backporting 21.05 Relase notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

[onny]

Don't know how to fix the NixOS manual checks :(

[mohe2015]

Don't know how to fix the NixOS manual checks :(

Just run nixos/doc/manual/md-to-db.sh

[happysalada]

One small thing, I'm trying to add the ability for caddy to merge multiple configs.
The idea being that if you enable caddy, it wouldn't override your config and you could just merge everything.
You might be interested by the PR #134384
It might affect slightly your PR.

[happysalada]

That PR has just been merged. There is now a virtualHosts option in caddy that works in the following way

caddy.virtualHosts."http://hostname" = {
   serverAliases = [ "www.hostname" ]; (optional)
   extraConfig = ''
          root    * /${pkg hostName cfg}/share/wordpress
          file_server
          php_fastcgi unix/${config.services.phpfpm.pools."wordpress-${hostName}".socket}
          @uploads {
            path_regexp path /uploads\/(.*)\.php
          }
          rewrite @uploads /
          @wp-admin {
            path  not ^\/wp-admin/*
          }
          rewrite @wp-admin {path}/index.php?{query}
   ''
};

basically at the moment everything is dumped into extraConfig. I'm open to feedback on what to options to extract from caddy users.
If you don't mind rebasing, I can help you get this merged.
(the one advantage of having the virtualhosts is that now caddy config is merged and not overridden, so caddy users can use caddy to expose other things).

[onny]

If you don't mind rebasing, I can help you get this merged.
(the one advantage of having the virtualhosts is that now caddy config is merged and not overridden, so caddy users can use caddy to expose other things).

Thank you for the info and for your work! I rebased this PR and it should work now 👍

[happysalada]

Thank you!