Support illumos servers

[dertuxmalwieder]

Describe you feature request

Is your feature request related to a problem? Please describe.
I was actually curious about whether my one remaining PHP server could be improved by coupling Caddy with FrankenPHP. Alas, it can't:

> curl https://frankenphp.dev/install.sh | sh
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  2186  100  2186    0     0   9802      0 --:--:-- --:--:-- --:--:--  9891
❗ FrankenPHP is not supported on SunOS and i86pc

That makes no sense, given that Caddy works just well and Go is pretty much portable.

Describe the solution you'd like
Make the error go away.

Describe alternatives you've considered
I'll just stick with php-fpm for the foreseeable future, I guess.

[dunglas]

The message is a bit misleading. We don't provide pre-compiled binaries nor officially support this platform. But it may work if you compile FrankenPHP from sources.

For instance, compiling from sources on FreeBSD works and is (community) supported.

Please report if you have any issue with a manually compiled version.

[dertuxmalwieder]

Building FrankenPHP with xcaddy does (probably) work. Whoops! (I'll need to figure out a few dependencies though, but that's not an upstream issue.)

Suggestion, while we're at it: Rephrase that message to avoid further confusion? It should probably be "there are no prebuilt binaries for $(ARCH), have you tried to compile it yourself?" or something. 🤔

[henderkes]

reminder to self: update install.sh script with link to building from source @henderkes

[dunglas]

We could even compile form sources if no prebuilt binary is available!

[henderkes]

That's too complex for the installer script, as we can't possibly check for every eventual dependency or package name on every OS. I think adding to the docs is the best we can do.