Run cleanups as root

Dockerfile

@@ -37,11 +37,11 @@ RUN npm -g install Haraka \
     && rm -f /home/node/.npm-global/lib/node_modules/Haraka/plugins/auth/auth_ldap.js \
     && rm -f /home/node/.npm-global/lib/node_modules/Haraka/plugins/rcpt_tp.ldap.js
 
+USER root
+
 RUN apt-get -y remove git && apt-get -y auto-remove && \
     rm -rf /var/lib/apt/lists/*
 
-USER root
-
 # Port 80 is used for LetsEncrypt
 EXPOSE 25 80 587