Used tabs for indentation in Dockerfiles

data/Dockerfiles/dovecot/Dockerfile

@@ -20,7 +20,7 @@ RUN apt-get update \
 	automake \
 	syslog-ng \
 	syslog-ng-core \
-    syslog-ng-mod-redis \
+	syslog-ng-mod-redis \
 	ca-certificates \
 	supervisor \
 	wget \
@@ -88,7 +88,7 @@ RUN chmod +x /usr/local/lib/dovecot/sieve/rspamd-pipe-ham \
 
 RUN groupadd -g 5000 vmail \
 	&& groupadd -g 401 dovecot \
-    && groupadd -g 402 dovenull \
+	&& groupadd -g 402 dovenull \
 	&& useradd -g vmail -u 5000 vmail -d /var/vmail \
 	&& useradd -c "Dovecot unprivileged user" -d /dev/null -u 401 -g dovecot -s /bin/false dovecot \
 	&& useradd -c "Dovecot login user" -d /dev/null -u 402 -g dovenull -s /bin/false dovenull