Add custom docker image

.gitlab-ci.yml

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+image: docker:stable
+
+stages:
+- build
+
+build amd64:
+  stage: build
+  tags:
+  - amd64
+  only:
+  - master
+  before_script:
+  - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+  script:
+  - docker pull $CI_REGISTRY_IMAGE:latest || true
+  - synversion=$(cat synapse/__init__.py | grep '__version__ = "' | sed -E 's/^__version__ = "(.+)"$/\1/')
+  - docker build --pull --cache-from $CI_REGISTRY_IMAGE:latest --tag $CI_REGISTRY_IMAGE:latest --tag $CI_REGISTRY_IMAGE:$synversion .
+  - docker push $CI_REGISTRY_IMAGE:latest
+  - docker push $CI_REGISTRY_IMAGE:$synversion
+  - docker rmi $CI_REGISTRY_IMAGE:latest $CI_REGISTRY_IMAGE:$synversion

Dockerfile

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+FROM debian:buster-slim
+
+MAINTAINER Tulir Asokan <tulir@maunium.net>
+
+RUN set -ex && export DEBIAN_FRONTEND=noninteractive \
+    && apt-get clean \
+    && apt-get update -y -q --fix-missing \
+    && apt-get upgrade -y \
+    && apt-get install -y --no-install-recommends \
+        libffi6 \
+        libjpeg62-turbo \
+        libssl1.1 \
+        libtool \
+        libxml2 \
+        libpq5 \
+        libxslt1.1 \
+        python3 \
+        python3-setuptools \
+        libjemalloc2 \
+        zlib1g
+
+COPY . /synapse
+WORKDIR /synapse
+
+RUN set -ex && export DEBIAN_FRONTEND=noninteractive \
+    && buildDeps=' \
+        file \
+        gcc \
+        git \
+        libevent-dev \
+        libffi-dev \
+        libgnutls28-dev \
+        libjpeg62-turbo-dev \
+        libldap2-dev \
+        libsasl2-dev \
+        libssl-dev \
+        libtool \
+        libxml2-dev \
+        libxslt1-dev \
+        linux-headers-amd64 \
+        zlib1g-dev \
+        python3-dev \
+        python3-pip \
+        libpq-dev' \
+    && apt-get install -y --no-install-recommends $buildDeps \
+    && pip3 install --upgrade wheel \
+    && pip3 install --upgrade .[all] \
+            'git+https://github.com/maunium/synapse-simple-antispam#egg=synapse-simple-antispam' \
+            'git+https://github.com/devture/matrix-synapse-shared-secret-auth#egg=shared_secret_authenticator' \
+    && apt-get purge --auto-remove -y $buildDeps \
+    && apt-get clean \
+    && rm -rf /synapse
+
+VOLUME ["/data"]
+ENV LD_PRELOAD="/usr/lib/x86_64-linux-gnu/libjemalloc.so.2"
+
+ENTRYPOINT ["python3", "-m", "synapse.app.homeserver"]
+CMD ["--keys-directory", "/data", "-c", "/data/homeserver.yaml"]