Add GreptimeDB docs package and trim CI matrix

packaging/alpine/local/greptimedb/APKBUILD

@@ -1,7 +1,7 @@
 # Maintainer: Joachim Schlöffel <me@joachim-schloeffel.com>
 pkgname=greptimedb
 pkgver=1.0.2
-pkgrel=1
+pkgrel=2
 pkgdesc="Cloud-native observability database for metrics, logs, and traces"
 url="https://github.com/GreptimeTeam/greptimedb"
 arch="x86_64"
@@ -31,6 +31,7 @@ makedepends="
 install="$pkgname.pre-install"
 subpackages="
 	$pkgname-datanode-openrc:_openrc_datanode:noarch
+	$pkgname-docs:_docs:noarch
 	$pkgname-flownode-openrc:_openrc_flownode:noarch
 	$pkgname-frontend-openrc:_openrc_frontend:noarch
 	$pkgname-metasrv-openrc:_openrc_metasrv:noarch
@@ -111,6 +112,14 @@ _openrc_frontend() { _openrc_service frontend; }
 _openrc_metasrv() { _openrc_service metasrv; }
 _openrc_standalone() { _openrc_service standalone; }
 
+_docs() {
+	pkgdesc="$pkgdesc (configuration examples and reference)"
+	depends=""
+
+	mkdir -p "$subpkgdir"/usr/share/doc/$pkgname
+	cp -a "$builddir"/config "$subpkgdir"/usr/share/doc/$pkgname/
+}
+
 sha512sums="
 7f4ac722b84a26816030e65d504b37a53edfca15de669a4f6ee7a903f1a29c8358dcc2376a0a6cfd9ded13b0c5d7550a6856b9b10dc8cd080c6b12970553a0ea  greptimedb-1.0.2.tar.gz
 29cc3376753487b216748e3f85e12639830e1ac4a763e94f330f87c3651a8ef9de35732958311c0049e1b7cbb4e90a9e602b3aff43297fe088c5ce795a110a79  datanode.toml