Move post-install scripts that contain openrc-specific commands to openrc subpackages

Closes #3045 (closed)

This MR moves all post-install files that contain openrc-specific configs or commands to their respective subpackage. This is required for said packages to be installed properly on a systemd-based system. Otherwise, APK will error on the install.

When systemd is merged these packages will need to have a respective systemd subpackage as well so they can still function as expected.

Todo:

• Finish moving testing scripts.
• Modify nonfree-firmware and certain kernel packages to not automatically install with openrc. (Maybe keep the original subpackage but use install_if="$pkgname-nonfree-firmware=$pkgver-r$pkgrel openrc with the openrc subpackages?)

device/community/device-fairphone-fp4/APKBUILD

@@ -3,7 +3,7 @@
 pkgname=device-fairphone-fp4
 pkgdesc="Fairphone 4"
 pkgver=3
-pkgrel=0
+pkgrel=1
 url="https://postmarketos.org"
 license="MIT"
 arch="aarch64"
@@ -39,7 +39,7 @@ depends="
 "
 makedepends="devicepkg-dev"
 replaces="hexagonrpcd-openrc"
-install="$pkgname.post-install $pkgname.post-upgrade"
+subpackages="$pkgname-openrc"
 source="
 	81-libssc-fairphone-fp4.rules
 	90-feedbackd-aw8695.rules
@@ -63,6 +63,13 @@ package() {
 		"$pkgdir"/etc/conf.d/hexagonrpcd-adsp-sensorspd
 }
 
+openrc() {
+	install_if="$pkgname=$pkgver-r$pkgrel openrc"
+	install="$subpkgname.post-install $subpkgname.post-upgrade"
+
+	mkdir -p "$subpkgdir"
+}
+
 sha512sums="
 2c16ba75e0077b2b1eaefa4c73b287475505a1aeb291ec29316d41cc094277320f9d2aaabfd91eb1dc0f488ab2d61a94faef16e7afe0f1e226779113761b9a37  81-libssc-fairphone-fp4.rules
 2974ccc172bf1299daeb0bc746879b3a1db1fbc3a2b163a02a6554fed6ed9f733144bcf976cd2441c5664d496dcce3ae943f4314c653470dc07dda0de5ad632b  90-feedbackd-aw8695.rules