update docker build & instructions for the necessary matching user

Dockerfile

@@ -28,7 +28,7 @@ RUN apk del .build-deps
 FROM python:3.8-alpine3.18 as production
 
 # Create a user to run our application
-RUN adduser -D myuser
+RUN adduser -D myuser -u 1000
 
 # Copy the dependencies and installed packages from the builder image
 WORKDIR /app

README.md

@@ -6,6 +6,7 @@
 export PUSH_SERVER_VERSION=0.1
 
 # This command is also in build.sh
+# Note that there is a user with the uid 1000 inside the Dockerfile: make sure that such a user exists on the server and has write access to the database.
 docker build --tag py-push-server:amd-$PUSH_SERVER_VERSION --platform linux/amd64 .
 
 docker save -o ~/dl/py-push-server-amd-$PUSH_SERVER_VERSION.tar py-push-server:amd-$PUSH_SERVER_VERSION
@@ -22,7 +23,7 @@ bzip2 -d py-push-server-amd-$PUSH_SERVER_VERSION.tar.bz2
 
 sudo docker load -i py-push-server-amd-$PUSH_SERVER_VERSION.tar
 
-sudo docker run -d -p 8900:3000 -v ~/py-push-server-db:/srv/py-push-server/data --name py-push-server-$PUSH_SERVER_VERSION py-push-server:amd-$PUSH_SERVER_VERSION
+sudo docker run -d -p 8900:3000 -v ~/py-push-server-db:/app/instance/data --name py-push-server-$PUSH_SERVER_VERSION py-push-server:amd-$PUSH_SERVER_VERSION
 ```