refacto(react-rust-postgres): replace rocket by actix-web

Signed-off-by: Jérémie Drouet <jeremie.drouet@gmail.com>

react-rust-postgres/backend/Dockerfile

@@ -1,8 +1,4 @@
-FROM jdrouet/rust-nightly:buster-slim AS base
-
-RUN apt-get update \
-  && apt-get install -y libpq-dev \
-  && rm -rf /var/lib/apt/lists/*
+FROM rust:buster AS base
 
 ENV USER=root
 ENV ROCKET_ADDRESS=0.0.0.0