fix: reduce docker image size (#301)

* fix: reduce docker image size

* fix: suppress docker lint errors

.dockerignore

@@ -0,0 +1,19 @@
+.dockerignore
+.DS_Store
+.git
+.github
+.gitignore
+.gitmodules
+.idea
+.jekyll-metadata
+.sass-cache
+tests
+_site
+CONTRIBUTING.md
+Dockerfile
+Dockerfile.archive
+docker-compose.yml
+Gemfile
+Gemfile.lock
+_website*.json
+**/pg-data

.github/workflows/docker.yml

@@ -21,7 +21,10 @@ jobs:
       - name: Docker Lint
         id: docker-lint
         run: |
-          docker run --rm -i hadolint/hadolint < Dockerfile
+          docker run --rm -i ghcr.io/hadolint/hadolint hadolint \
+          --ignore DL3008 \
+          --ignore DL3059 \
+          - < Dockerfile
       - name: Run tests
         id: smoketest
         run: |

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.7
+FROM python:3.7-slim-buster
 
 ENV PYTHONUNBUFFERED 1
 ENV PIP_DISABLE_PIP_VERSION_CHECK=1
@@ -23,30 +23,42 @@ LABEL org.label-schema.build-date=$BUILD_DATE \
 
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 
-RUN curl -fsSL https://nginx.org/keys/nginx_signing.key | apt-key add - && \
-    echo "deb https://nginx.org/packages/debian/ buster nginx" | tee /etc/apt/sources.list.d/nginx.list
-
-# hadolint ignore=DL3008
-RUN curl -fsSL https://www.mongodb.org/static/pgp/server-4.2.asc | apt-key add - && \
-    echo "deb https://repo.mongodb.org/apt/debian buster/mongodb-org/4.2 main" | tee /etc/apt/sources.list.d/mongodb-org-4.2.list && \
-    apt-get update && \
+RUN apt-get update && \
     apt-get install -y --no-install-recommends \
-    gettext-base \
-    libffi-dev \
+    build-essential \
+    curl \
+    git \
+    gnupg2 \
     libldap2-dev \
     libpq-dev \
     libsasl2-dev \
-    mongodb-org-shell \
-    nginx \
     postgresql-client \
     python3-dev \
     supervisor \
-    wget \
     xmlsec1 && \
     apt-get -y clean && \
     apt-get -y autoremove && \
     rm -rf /var/lib/apt/lists/*
 
+RUN curl -fsSL https://nginx.org/keys/nginx_signing.key | apt-key add - && \
+    echo "deb https://nginx.org/packages/debian/ buster nginx" | tee /etc/apt/sources.list.d/nginx.list && \
+    apt-get update && \
+    apt-get install -y --no-install-recommends \
+    nginx && \
+    apt-get -y clean && \
+    apt-get -y autoremove && \
+    rm -rf /var/lib/apt/lists/*
+
+# hadolint ignore=DL3008
+RUN curl -fsSL https://www.mongodb.org/static/pgp/server-4.2.asc | apt-key add - && \
+    echo "deb https://repo.mongodb.org/apt/debian buster/mongodb-org/4.2 main" | tee /etc/apt/sources.list.d/mongodb-org-4.2.list && \
+    apt-get update && \
+    apt-get install -y --no-install-recommends \
+    mongodb-org-shell && \
+    apt-get -y clean && \
+    apt-get -y autoremove && \
+    rm -rf /var/lib/apt/lists/*
+
 COPY requirements*.txt /app/
 # hadolint ignore=DL3013
 RUN pip install --no-cache-dir pip virtualenv && \