docker (prosody): remove unused entrypoint.sh file and sed from Dockerfile:

The `sed` is not necessary anymore in recent Docker images, since
https://github.com/prosody/prosody-docker/pull/65 has been merged.

docker/prosody-e2e/Dockerfile

@@ -16,7 +16,3 @@ COPY --chown=root:prosody prosody.cfg.lua /etc/prosody/prosody.cfg.lua
 COPY --chown=root:tls-cert certificates/server1.test/cert.pem /usr/share/libervia/certificates/server1.test.pem
 COPY --chown=root:tls-cert certificates/server1.test/key.pem /usr/share/libervia/certificates/server1.test-key.pem
 
-# we add exec to handle properly signals, this is missing upstream
-# FIXME: to be removed when new images are generated with
-#        https://github.com/prosody/prosody-docker/pull/65
-RUN sed -i "s/^runuser -u prosody/exec \0/" /entrypoint.sh

docker/prosody-e2e/entrypoint.sh

@@ -1,15 +0,0 @@
-#!/bin/bash
-set -e
-
-usermod -u "$(stat -c %u /var/lib/prosody/.)" prosody
-
-if [[ "$1" != "prosody" ]]; then
-    exec prosodyctl "$@"
-    exit 0;
-fi
-
-if [ "$LOCAL" -a  "$PASSWORD" -a "$DOMAIN" ] ; then
-    prosodyctl register "$LOCAL" "$DOMAIN" "$PASSWORD"
-fi
-
-exec runuser -u prosody -- "$@"