build: make docker root-less

Dockerfile

@@ -1,13 +1,21 @@
-FROM nginx
-RUN rm -rf /usr/share/nginx/html/*
+FROM nginxinc/nginx-unprivileged:1.25-alpine
 
-ADD build /usr/share/nginx/html
+# Non root user
+ENV NGINX_USER_ID=101
+ENV NGINX_GROUP_ID=101
+ENV NGINX_USER=nginx
 
-RUN rm etc/nginx/conf.d/default.conf
-COPY ./nginx.conf /etc/nginx/conf.d/
+USER $NGINX_USER_ID
+
+# Add build to nginx root webapp
+COPY --chown=$NGINX_USER:$NGINX_USER build /usr/share/nginx/html
 
+# Copy nginx configuration
+RUN rm etc/nginx/conf.d/default.conf
+COPY --chown=$NGINX_USER:$NGINX_USER nginx.conf etc/nginx/conf.d/
 
-COPY entrypoint.sh /entrypoint.sh
+# Add entrypoint
+COPY --chown=$NGINX_USER:$NGINX_USER entrypoint.sh /entrypoint.sh
 RUN chmod 755 /entrypoint.sh
 ENTRYPOINT [ "/entrypoint.sh" ]