fix(gtk-3): Compile gschemas post-install and add subpackage (#30696)

gschemas need to be compiled post-install otherwise they will not be
found at runtime

Additionally, add a subpackage containing the compiled schemas as
post-install triggers are not ran during image assembly

Signed-off-by: RJ Sampson <rj.sampson@chainguard.dev>

gtk-3.yaml

@@ -1,10 +1,17 @@
 package:
  name: gtk-3
  version: 3.24.43
- epoch: 1
+ epoch: 2
  description: The GTK+ Toolkit (v3)
  copyright:
  - license: LGPL-2.1-or-later
+ scriptlets:
+ post-install: |
+ #!/bin/sh
+ glib-compile-schemas /usr/share/glib-2.0/schemas
+
+vars:
+ gschemas: "usr/share/glib-2.0/schemas"
 
 # creates a new var that contains only the major and minor version to be used in the fetch URL
 # e.g. 2.46.0 will create a new var mangled-package-version=2.46
@@ -99,7 +106,7 @@ pipeline:
  - uses: strip
 
 subpackages:
- - name: gtk-3-dev
+ - name: ${{package.name}}-dev
  pipeline:
  - uses: split/dev
  dependencies:
@@ -116,16 +123,27 @@ subpackages:
  - wayland-dev
  description: gtk+3 dev
 
- - name: gtk-3-doc
+ - name: ${{package.name}}-doc
  pipeline:
  - uses: split/manpages
  description: gtk+3 manpages
 
- - name: gtk-3-lang
+ - name: ${{package.name}}-lang
  pipeline:
  - uses: split/locales
  description: gtk+3 locales
 
+ - name: ${{package.name}}-compiled-gschemas
+ description: Compiled gschemas for GTK 3
+ dependencies:
+ runtime:
+ - ${{package.name}}
+ pipeline:
+ - runs: |
+ glib-compile-schemas "${{targets.destdir}}/${{vars.gschemas}}"
+ install -Dm755 "${{targets.destdir}}/${{vars.gschemas}}/gschemas.compiled" "${{targets.contextdir}}/${{vars.gschemas}}/gschemas.compiled"
+ rm "${{targets.destdir}}/${{vars.gschemas}}/gschemas.compiled"
+
 update:
  enabled: true
  release-monitor: