fix

langs/prolog/Dockerfile

@@ -0,0 +1 @@
+RUN apt-get install gprolog -y

langs/prolog/run.sh

@@ -0,0 +1,10 @@
+IN="$(mktemp --suffix .pl)"
+OUT="$(mktemp)"
+
+cat > "$IN"
+
+gplc -o "$OUT" "$IN"
+
+if [ $? -eq 0 ]; then
+  exec "$OUT"
+fi