Package request: xinetd
https://github.com/opensuse/xinetd
Was able to build and run successfully on Alpine 3.14:
apk add wget gcc libc-dev make
wget -q https://github.com/opensuse/xinetd/releases/download/2.3.15.4/xinetd-2.3.15.4.tar.xz
tar xJf xinetd-2.3.15.4.tar.xz
cd xinetd-2.3.15.4
./configure
make
make install