initial

.gitignore

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+*~
+.*~

.gitlab-ci.yml

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+image: docker:stable
+
+stages:
+        - build
+
+variables:
+        IMAGE_NAME: registry.gitlab.com/wolutator/exim-docker
+
+build:
+        stage: build
+        tags:
+                - hottis
+                - linux
+                - docker
+        script: 
+                - VERSION=`cat VERSION`
+                - echo "Version is $VERSION"
+                - docker build --tag $IMAGE_NAME:latest --tag $IMAGE_NAME:$VERSION .
+                - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
+                - docker push $IMAGE_NAME:latest
+                - docker push $IMAGE_NAME:$VERSION
+

Dockerfile

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+FROM debian:latest
+
+LABEL Maintainer="Wolfgang Hottgenroth <woho@hottis.de>"
+LABEL ImageName="registry.gitlab.com/wolutator/exim-docker"
+
+RUN \
+  apt update && \
+  apt install -y exim4 && \ 
+  rm -rf /var/lib/apt/lists/*
+
+VOLUME /etc/exim4
+
+
+ 
+

VERSION

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+0.1