add piston nix pkg for openjdk-java

packages/java/15.0.2/build.sh

@@ -1,9 +0,0 @@
-#!/usr/bin/env bash
-
-# Put instructions to build your package in here
-
-curl "https://download.java.net/java/GA/jdk15.0.2/0d1cfde4252546c6931946de8db48ee2/7/GPL/openjdk-15.0.2_linux-x64_bin.tar.gz" -o java.tar.gz
-
-tar xzf java.tar.gz --strip-components=1
-rm java.tar.gz
-

packages/java/15.0.2/environment

@@ -1,4 +0,0 @@
-#!/usr/bin/env bash
-
-# Put 'export' statements here for environment variables
-export PATH=$PWD/bin:$PATH

packages/java/15.0.2/metadata.json

@@ -1,5 +0,0 @@
-{
-    "language": "java",
-    "version": "15.0.2",
-    "aliases": []
-}

packages/java/15.0.2/run

@@ -1,7 +0,0 @@
-#!/usr/bin/env bash
-
-# Put instructions to run the runtime
-mv $1 $1.java
-filename=$1.java
-shift
-java $filename "$@"

packages/java/15.0.2/test.java

@@ -1,5 +0,0 @@
-public class HelloWorld {
-    public static void main(String[] args) {
-        System.out.println("OK");
-    }
-}