build: docker image and compose file

Dockerfile, script entrypoint, docker-compose.yml minimaliste.

docker/Dockerfile

@@ -47,7 +47,7 @@ RUN apk update && \
 
 # Intall
 COPY --from=build /target/release/duniter /usr/local/bin/duniter
-COPY docker-entrypoint /usr/local/bin/
+COPY docker/docker-entrypoint /usr/local/bin/
 
 # Configuration
 # rpc, rpc-ws, p2p, telemetry