refactor: refs #6695 update Jenkinsfile and Dockerfile to use 'developer'

Jenkinsfile

@@ -101,10 +101,6 @@ pipeline {
 
                             def image = docker.build('lilium-dev', '-f docs/Dockerfile docs')
                             image.inside("--network ${env.COMPOSE_PROJECT}_default -e TZ -e CI") {
-                                sh 'pwd'
-                                sh 'ls -l'
-                                sh 'whoami'
-                                sh 'id -u'
                                 sh 'cypress run --browser chromium --spec test/cypress/integration/claim/claimAction.spec.js'
                             }
                         }

docs/Dockerfile

@@ -30,11 +30,12 @@ RUN apt-get update \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
 
-RUN useradd -r -u 1000 -m -d /home/dev-user dev-user
-USER dev-user
+RUN groupadd -r -g 1000 developer \
+    && useradd -r -u 1000 -g developer -m -d /home/developer developer
+USER developer
 
 ENV SHELL bash
-ENV PNPM_HOME="/home/dev-user/.local/share/pnpm"
+ENV PNPM_HOME="/home/developer/.local/share/pnpm"
 ENV PATH="$PNPM_HOME:$PATH"
 
 RUN pnpm setup \