From-source Godot

[snoopdouglas]

Implement building Godot from source. There are a few considerations here:

• This'll replace the download+install step we currently use for official builds.
• We'll almost certainly want to do this in a container, and probably with a separate image to the exporter.
• People will often be following this guide.
  • So, strip should be available.
  • Changing build flags should be available.
• People will often be using the engine compilation configuration editor, so perhaps a shortcut should be provided to produce a build with just that config (using the official repo).
  • So, we'll want to provide the option to only use the from-source build when exporting.
  • In this case we'll definitely need the export templates built, and possibly the editor too.
• Option to checkout any ref on the official repo, or checkout a custom repo + ref.
• Option to use some other repo on local disk.
• Like with Option to use an arbitary local Godot #10, if the project wants to use packaging with a from-source Godot build, the project will need to tell Gobbo what the equivalent official version of Godot is - unless we can deduce it.

Sample configs

Build the official 4.3 release yourself for some reason:

[godot.src]
ref = "4.3-stable"

Edge Godot:

[godot.src]
ref = "main"

Use the fallback text server:

[godot.src]
ref = "4.3-stable"
flags = {
    module_text_server_adv_enabled = "no"
    module_text_server_fb_enabled = "yes"
}

Use a compilation config:

[godot.src]
ref = "4.3-stable"
config = "godot.build" # Path relative to gobbo.toml

Use a local repo:

[godot.src]
local = "/path/to/repo"
# Do we want to allow specifying a ref for checkout or is that insane?