build: frontend container cannot be built since npm version 20.15.1 (#…

…10536)

Frontend docker container build fails with new npm:latest (20.15.1) version. 
See npm/cli#7639

This PR set the version to the previous 20.15.0 until it's fixed.

--
Co-authored-by: Alex Garel <alex@garel.org>

Dockerfile.frontend

@@ -3,7 +3,8 @@
 ARG USER_UID=1000
 ARG USER_GID=1000
 
-FROM node:lts AS builder
+# 2024-07-11 fixed to 20.15.0 because of https://github.com/npm/cli/issues/7639 in current LTS
+FROM node:20.15.0 AS builder
 ARG USER_UID
 ARG USER_GID
 RUN usermod --uid $USER_UID node && \