feat(docker): add cache for faster rebuild (#1507)

- Closes #1502

docker/authserver/Dockerfile

@@ -2,6 +2,4 @@ FROM ubuntu:bionic
 
 RUN apt update && apt install -y libmysqlclient-dev libssl-dev libace-6.* libace-dev;
 
-COPY --from=azerothcore/build:latest /azeroth-server/bin /azeroth-server/bin
-
 CMD ["/azeroth-server/bin/authserver"]

docker/authserver/README.md

@@ -28,6 +28,7 @@ docker build -t azerothcore/authserver -f docker/authserver/Dockerfile docker/au
 
 ```
 docker run --name ac-authserver \
+    --mount type=bind,source="$(pwd)"/docker/authserver/bin/,target=/azeroth-server/bin \
     --mount type=bind,source="$(pwd)"/docker/authserver/etc/,target=/azeroth-server/etc \
     --mount type=bind,source="$(pwd)"/docker/authserver/logs/,target=/azeroth-server/logs \
     -p 127.0.0.1:3724:3724 \