[Feature:Autograding] Add Salsa image

[ION606]

Please check if the PR fulfills these requirements:

• Tests for the changes have been added/updated (if possible)
• Documentation has been updated/added if relevant

What is the current behavior?

none

What is the new behavior?

we can now run salsa files

Other information?

this is not a breaking change and I tested it using some simple files (I included an example below):

module demo;

/*
   Actors with this behavior simply create a migrate actor with the specified UAN and first UAL    
   and then migrate to the second UAL.
*/
behavior Migrate {

   void print() {

      standardOutput<-println( "Migrate actor just migrated here." );
   }

   void act( String[] args ) {

         if (args.length != 3) {
                 standardOutput<-println( "Usage: java migration.Migrate  <UAN> <srcUAL> <destUAL> " );

                 return;
        }

        UAN uan = new UAN(args[0]);
        UAL ual = new UAL(args[1]);
        
        Migrate  migrateActor = new Migrate() at (uan, ual);
      
        migrateActor<-print() @ 
        migrateActor<-migrate( args[2] ) @ 
        migrateActor<-print(); 
         
   }     
    
}   

[ION606]

I should note that my compilation command is java -cp $SALSA_COMPILER_JAR:. salsac.SalsaCompiler *.salsa; javac -classpath $SALSA_COMPILER_JAR:. *.java instead of java -cp $SALSAPATH/salsa$SALSAsalsac.SalsaCompiler \!*.salsa; javac -classpath $SALSAPATH/salsa$SALSAVER.jar:. \!*.java because the latter doesn't work.

If you want to test it, you can find it at https://hub.docker.com/repository/docker/ion606/salsa/general

resolved by 19712b5