Revert "embed the script in then dockerfile"

This reverts commit b7481d3.

Author: lucarin91

adbd.Dockerfile

@@ -10,16 +10,7 @@ RUN useradd -m --create-home --shell /bin/bash --user-group --groups sudo arduin
     mkdir /home/arduino/ArduinoApps && \
     chown -R arduino:arduino /home/arduino/ArduinoApps
 
-RUN cat > /usr/local/bin/pong-server.sh <<'EOF'
-#!/bin/sh
-
-PORT=9999
-
-while true; do
-  echo -n "pong" | nc -l -p $PORT
-done
-EOF
-RUN chmod +x /usr/local/bin/pong-server.sh
+ADD scripts/pong-server.sh /usr/local/bin/pong-server.sh
 
 WORKDIR /home/arduino
 EXPOSE 22

scripts/pong-server.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+PORT=9999
+
+while true; do
+  echo -n "pong" | nc -l -p $PORT
+done