add musl check

build_release.sh

@@ -1,2 +1,23 @@
-rm dist/*
-crystal build ./src/pmng.cr --release --progress -o ./dist/pmng-0.2.5-linux-x86_64
+#!/bin/sh
+
+# Preparing
+if [ -d "./dist/" ];
+then
+	rm dist/* 2> /dev/null
+else
+	mkdir dist/
+fi
+
+# Detect Musl C library
+# thx @Unmanned Player https://stackoverflow.com/a/60471114
+
+libc=$(ldd /bin/ls | grep 'musl' | head -1 | cut -d ' ' -f1)
+if [ -z $libc ];
+then
+	# build libc
+    crystal build ./src/pmng.cr --release --progress -L/usr/lib/ -o ./dist/pmng-0.2.5-linux-x86_64
+else
+	# Build musl
+	crystal build ./src/pmng.cr --release --progress -o ./dist/pmng-0.2.5-linux-musl-x86_64
+fi
+