add compilers for competitive programming

install_alpine.sh

@@ -155,6 +155,7 @@ EOF
 
   competitiveprogramming() {
     echo "CP..."
+    doas apk add clang15-extra-tools openjdk17
     git clone https://git.junickim.me/junikimm717/linuxcp "$HOME/cp"
     go install git.junickim.me/junikimm717/cpgo@latest
   }