main/python3: compile .pyc for system site dir packages

ref https://gitlab.alpinelinux.org/alpine/aports/-/issues/11906
ref https://gitlab.alpinelinux.org/alpine/abuild/-/merge_requests/194

main/python3/APKBUILD

@@ -4,17 +4,19 @@ pkgname=python3
 # the python3-tkinter's pkgver needs to be synchronized with this.
 pkgver=3.11.3
 _basever="${pkgver%.*}"
-pkgrel=1
+pkgrel=2
 pkgdesc="A high-level scripting language"
 url="https://www.python.org/"
 arch="all"
 license="PSF-2.0"
+triggers="$pkgname-pycompile.trigger=/usr/lib/python$_basever"
 subpackages="
 	$pkgname-dbg
 	$pkgname-dev
 	$pkgname-doc
 	$pkgname-tests::noarch
 	$pkgname-gdbm
+	$pkgname-pycompile
 	"
 makedepends="
 	!gettext-dev
@@ -211,6 +213,15 @@ gdbm() {
 	amove usr/lib/python3*/lib-dynload/_gdbm.cpython*
 }
 
+pycompile() {
+	pkgdesc="automatically compile python3 package pycache"
+	install_if="$pkgname=$pkgver-r$pkgrel"
+
+	mkdir -p "$subpkgdir"/usr/lib/python3
+	# be nonempty so trigger is written ??
+	touch "$subpkgdir"/usr/lib/python3/__pycachetrigger__
+}
+
 sha512sums="
 a3bba4b69322a47bfeefe42ba0fd7331b5b67fd2ab41441e2219d16ef8c6f307f1a48977afd073c18cfd24ec6cb1bfe0c4bb4b273031eb524dc7e9fb5fbcc3b6  Python-3.11.3.tar.xz
 fe123dd871f7a3fa868c499a957b94f1d815a1e1de964aaff1116c579defd4d9d1e9b7eb418cf114b169b97426ed603bf4b1e61b45ec483df06abe988c6a30ee  fix-xattrs-glibc.patch

main/python3/python3-pycompile.trigger

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+# just two jobs to be a bit faster but not overuse resources
+python3 -m compileall -j2 -q "$@"