user/smtpd-starttls-proxy: add -doc package

user/smtpd-starttls-proxy/APKBUILD

@@ -2,7 +2,7 @@
 # Maintainer: Laurent Bercot <ska-adelie@skarnet.org>
 pkgname=smtpd-starttls-proxy
 pkgver=0.0.1.3
-pkgrel=0
+pkgrel=1
 pkgdesc="An SMTP proxy implementing STARTTLS"
 url="https://skarnet.org/software/smtpd-starttls-proxy/"
 arch="all"
@@ -10,7 +10,7 @@ options="!check"  # No test suite.
 license="ISC"
 depends="s6 s6-networking"
 makedepends="skalibs-dev>=2.14 s6-dev>=2.12"
-subpackages="$pkgname-dev"
+subpackages="$pkgname-dev $pkgname-doc"
 source="https://skarnet.org/software/smtpd-starttls-proxy/smtpd-starttls-proxy-$pkgver.tar.gz"
 
 build() {
@@ -26,6 +26,8 @@ build() {
 
 package() {
 	make DESTDIR="$pkgdir" install
+	mkdir -p -m 0755 "$pkgdir/usr/share/doc"
+	cp -a "$builddir/doc" "$pkgdir/usr/share/doc/$pkgname"
 }
 
 sha512sums="55fc24d3923b7f3cf3137f4d36ed90ebfd2b603f55cfb6cd6d9ae3f67ec38706540c21c2f1a6257f5702e0a93dcba2e31fbfb99fae9d27e20002b265e78b0cf9  smtpd-starttls-proxy-0.0.1.3.tar.gz"