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[Dockerfiles] Do not persist DEBIAN_FRONTEND=noninteractive in images

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According to https://github.com/moby/moby/issues/4032#issuecomment-163689851
(and some other comments in the issue) it's not recommended to set
`DEBIAN_FRONTEND` via `ENV` in a Dockerfile.  `ARG` has the same
effect at build time but does not change `DEBIAN_FRONTEND` in the
final image, so I switched to it.  It should also work to remove it
completely.
This commit is contained in:
Michael Käufl
2017-05-13 16:29:18 +02:00
parent e081a847a1
commit 7fd982f948
7 changed files with 8 additions and 7 deletions
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data/Dockerfiles/dovecot/Dockerfile
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@@ -2,7 +2,7 @@ FROM debian:stretch-slim
#ubuntu:xenial
LABEL maintainer "Andre Peters <andre.peters@servercow.de>"
ENV DEBIAN_FRONTEND noninteractive
ARG DEBIAN_FRONTEND=noninteractive
ENV LC_ALL C
ENV DOVECOT_VERSION 2.2.29.1
ENV PIGEONHOLE_VERSION 0.4.18