Initial Dockerfile

.gitlab-ci.yml

+before_script:
+  - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
+
+build-master:
+  stage: build
+  script:
+    - docker build --pull -t $CI_REGISTRY_IMAGE .
+    - docker push $CI_REGISTRY_IMAGE
+  only:
+    - master

Dockerfile

+FROM docker:18.06.1
+
+LABEL com.example.vendor="PARAGON Executive Service GmbH" \
+      maintainer="juergen@paragon-es.de" \
+      version="1.0.0" \
+      description="An image for GitLab runner to build and test Drupal projects."
+
+ARG compose_version=1.21.2
+
+RUN apk update && \
+    apk add --no-cache curl openssl openssh ca-certificates wget make && \
+    \
+    wget -q https://alpine-pkgs.sgerrand.com/sgerrand.rsa.pub -O /etc/apk/keys/sgerrand.rsa.pub && \
+    wget -q https://github.com/sgerrand/alpine-pkg-glibc/releases/download/2.28-r0/glibc-2.28-r0.apk && \
+    apk add --no-cache glibc-2.28-r0.apk && \
+    rm glibc-2.28-r0.apk && \
+    ln -s /lib/libz.so.1 /usr/glibc-compat/lib/ && \
+    ln -s /lib/libc.musl-x86_64.so.1 /usr/glibc-compat/lib && \
+    \
+    apk add --no-cache bash python nodejs git unzip \
+        php7 php7-phar php7-json php7-dom php7-gd php7-mbstring php7-openssl \
+        php7-pdo php7-curl php7-xml php7-zip php7-session php7-ctype && \
+    ln -s /usr/bin/php7 /usr/local/bin/php &&\
+    \
+    wget -q https://github.com/docker/compose/releases/download/${compose_version}/docker-compose-`uname -s`-`uname -m` -O /usr/local/bin/docker-compose && \
+    chmod +x /usr/local/bin/docker-compose && \
+    \
+    wget -q https://getcomposer.org/composer.phar -O /usr/local/bin/composer && \
+    chmod +x /usr/local/bin/composer && \
+    composer selfupdate && \
+    \
+    git clone https://github.com/tj/git-extras.git && \
+    cd git-extras && \
+    git checkout $(git describe --tags $(git rev-list --tags --max-count=1)) && \
+    make install && \
+    cd .. && \
+    rm -rf git-extras

README.md

 # Usage
+
+TBD
+
+# Credit
+
+- [Image from jonaskello](https://github.com/jonaskello/docker-and-compose)
+- [Alpine glibc from sgerrand](https://github.com/sgerrand/alpine-pkg-glibc)