fix Dockerfile

Dockerfile

@@ -1,11 +1,12 @@
-ARG JULIA_VERSION=1.9
+ARG JULIA_VERSION=1.10.0-beta1
+ARG JUGSAW_SERVER=DOCKER
 FROM julia:$JULIA_VERSION
 
 # FIXME: no need to develop Jugsaw once it is registered
 COPY . /app
 WORKDIR /app
 # The environment varialbe `JUGSAW_SERVER=DOCKER` turns the local mode off
-RUN JUGSAW_SERVER=DOCKER julia --project=. -e "using Pkg; Pkg.instantiate()"
+RUN julia --project=. -e "using Pkg; Pkg.instantiate()"
 
-EXPOSE $dockerport
+EXPOSE 7860
 ENTRYPOINT ["julia", "--project=.", "-e", "import Jugsaw; include(\"app.jl\"); Jugsaw.Server.serve(Jugsaw.APP, port=7860);"]