community/trurl: fix manpage missing

Copy a line from ./mkrelease

community/trurl/APKBUILD

 # Maintainer: Jakub Jirutka <jakub@jirutka.cz>
 pkgname=trurl
 pkgver=0.16
-pkgrel=0
+pkgrel=1
 pkgdesc="command line tool for URL parsing and manipulation"
 url="https://curl.se/trurl/"
 arch="all"
 license="curl"
 makedepends="
 	curl-dev
+	perl
 	"
 checkdepends="
 	py3-packaging
@@ -19,6 +20,7 @@ builddir="$srcdir/trurl-trurl-$pkgver"
 
 build() {
 	make
+	cd2nroff trurl.md > trurl.1
 }
 
 check() {