Add setJava functionality to the docker container

[A7exSchin]

Title, see script below (adjust for debian)

#!/bin/bash                                                                                                                                                                                                   

#env variables can be changed only if we call the script with source setJava.sh                                                                                                                         

function removeFromPath () {
    export PATH=$(echo $PATH | sed -E -e "s;:$1;;" -e "s;$1:?;;")
}

if [ -n "${JAVA_HOME+x}" ]; then  
    removeFromPath $JAVA_HOME  
fi

oracleJava="/c/Program Files (x86)/Common Files/Oracle/Java/javapath"

case $1 in
	unset)
	    removeFromPath $oracleJava
		export JAVA_HOME=
	;;
	8)
		export JAVA_HOME=/c/ENGINE_LIB_DIR/build/java/win32/x86_64/jdk8u202-b08
	;;
	11)
		export JAVA_HOME=/c/ENGINE_LIB_DIR/build/java/win32/x86_64/jdk-11.0.5+10
	;;
	pai11)
		export JAVA_HOME=/C/ENGINE_LIB_DIR/build/java/win32/x86_64/pai-openjdk-11.0.5.10_windows-x64
	;;
	*)
		echo "usage error: setJava <version>\n version can be one of unset, 8, 11, pai11"
	;;
esac

echo JAVA_HOME=$JAVA_HOME
export PATH=$JAVA_HOME/bin:$PATH;
java -version