Removed root pw workaround (#437)

docker/selfhosted.Dockerfile

@@ -127,17 +127,6 @@ EXPOSE ${PORT}
 # Only copy the final release from the build stage
 COPY --from=builder /app/_build/${MIX_ENV}/rel/pinchflat ./
 
-# NEVER do this if you're running in an environment where you don't trust the user
-# (ie: most environments). This is only acceptable in a self-hosted environment.
-# The user could just run the whole container as root and bypass this anyway so
-# it's not a huge deal.
-# This removes the root password to allow users to assume root if needed. This is
-# preferrable to running the whole container as root so that the files/directories
-# created by the app aren't owned by root and are therefore easier for other users
-# and processes to interact with. If you want to just run the whole container as
-# root, use --user 0:0 or something.
-RUN passwd -d root
-
 HEALTHCHECK --interval=120s --start-period=10s \
   CMD curl --fail http://localhost:${PORT}/healthcheck || exit 1