From dfe092eb46da1a20f40b65fbc699e9620dba683c Mon Sep 17 00:00:00 2001
From: Dario Ernst <dario.ernst@rommelag.com>
Date: Fri, 6 Mar 2020 16:11:59 +0100
Subject: [PATCH] Use names for docker build stages in dovecot Dockerfile

---
 core/dovecot/Dockerfile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/core/dovecot/Dockerfile b/core/dovecot/Dockerfile
index 60f6ab9b..1e40bddf 100644
--- a/core/dovecot/Dockerfile
+++ b/core/dovecot/Dockerfile
@@ -1,4 +1,4 @@
-ARG DISTRO=alpine:3.10
+ARG DISTRO=alpine:3.10 as builder
 FROM $DISTRO
 WORKDIR /tmp
 RUN apk add git build-base automake autoconf libtool dovecot-dev xapian-core-dev icu-dev
@@ -27,7 +27,7 @@ RUN apk add --no-cache \
   dovecot dovecot-lmtpd dovecot-pop3d dovecot-submissiond dovecot-pigeonhole-plugin rspamd-client xapian-core \
   && mkdir /var/lib/dovecot
 
-COPY --from=0 /usr/lib/dovecot/lib21_fts_xapian_plugin.* /usr/lib/dovecot/
+COPY --from=builder /usr/lib/dovecot/lib21_fts_xapian_plugin.* /usr/lib/dovecot/
 
 COPY conf /conf
 COPY start.py /start.py