feat(docker): unroot docker image

Dockerfile

@@ -9,6 +9,12 @@ COPY docker /
 RUN if [ -n "${APT_PACKAGES}" ]; then apt-get update -y; apt-get install -y --no-install-recommends ${APT_PACKAGES}; apt-get clean; rm -rf /var/lib/apt/lists/* /var/tmp/* /tmp/*; fi && \
     if [ -n "${KESTRA_PLUGINS}" ]; then /app/kestra plugins install ${KESTRA_PLUGINS}; rm -rf /tmp/*; fi
 
+RUN groupadd kestra && \
+  useradd -m -g kestra kestra && \
+  chown -R kestra:kestra /app
+
+USER kestra
+
 ENTRYPOINT ["docker-entrypoint.sh"]
 
 CMD ["--help"]