Add docker support

db/docker_postgres.sh

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+#!/bin/bash
+set -e
+psql -v ON_ERROR_STOP=1 -U "$POSTGRES_USER" -c "CREATE EXTENSION btree_gist" openstreetmap
+make -C db/functions libpgosm.so
+psql -v ON_ERROR_STOP=1 -U "$POSTGRES_USER" -c "CREATE FUNCTION maptile_for_point(int8, int8, int4) RETURNS int4 AS '/db/functions/libpgosm', 'maptile_for_point' LANGUAGE C STRICT" openstreetmap
+psql -v ON_ERROR_STOP=1 -U "$POSTGRES_USER" -c "CREATE FUNCTION tile_for_point(int4, int4) RETURNS int8 AS '/db/functions/libpgosm', 'tile_for_point' LANGUAGE C STRICT" openstreetmap
+psql -v ON_ERROR_STOP=1 -U "$POSTGRES_USER" -c "CREATE FUNCTION xid_to_int4(xid) RETURNS int4 AS '/db/functions/libpgosm', 'xid_to_int4' LANGUAGE C STRICT" openstreetmap

docker/Dockerfile

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+FROM ruby:2.5-slim
+
+#install packages
+#fixes dpkg man page softlink error while installing postgresql-client [source: https://stackoverflow.com/a/52655008/5350059]
+RUN mkdir -p /usr/share/man/man1 && mkdir -p /usr/share/man/man7
+RUN apt-get update && apt-get install curl -y
+RUN apt-get clean && rm -rf /var/lib/apt/lists/*
+#npm is not available in Debian repo so following official instruction [source: https://github.com/nodesource/distributions/blob/master/README.md#debinstall]
+RUN curl -sL https://deb.nodesource.com/setup_10.x -o nodesource_setup.sh && bash nodesource_setup.sh && rm nodesource_setup.sh
+RUN apt-get install -y --no-install-recommends ruby-dev libarchive-dev libmagickwand-dev libxml2-dev libxslt1-dev build-essential libpq-dev libsasl2-dev imagemagick libffi-dev locales postgresql-client-9.6 nodejs
+RUN apt-get clean && rm -rf /var/lib/apt/lists/*
+RUN npm install yarn -g
+
+# Setup app location
+RUN mkdir -p /app
+WORKDIR /app
+
+# Install gems
+ADD Gemfile* /app/
+RUN bundle install
+
+# Setup local
+RUN sed -i -e 's/# en_GB.UTF-8 UTF-8/en_GB.UTF-8 UTF-8/' /etc/locale.gen && \
+    echo 'LANG="en_GB.UTF-8"'>/etc/default/locale && \
+    dpkg-reconfigure --frontend=noninteractive locales && \
+    update-locale LANG=en_GB.UTF-8
+
+ENV LANG en_GB.UTF-8

docker/Dockerfile.postgres

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+FROM postgres:11
+
+ADD db/docker_postgres.sh docker-entrypoint-initdb.d/docker_postgres.sh
+ADD db/functions/ db/functions/
+
+RUN apt-get update
+RUN apt-get install -y make build-essential postgresql-server-dev-all
+RUN apt-get clean && rm -rf /var/lib/apt/lists/*

docker/docker-compose.yml

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+version: '2'
+services:
+  web:
+    image: openstreetmap-website:v1
+    build:
+      context: ..
+      dockerfile: docker/Dockerfile
+    volumes:
+      - .:/app
+    ports:
+      - "3000:3000"
+    command: bundle exec rails s -p 3000 -b '0.0.0.0'
+    depends_on:
+      - db
+  db:
+    image: openstreetmap-db:v1
+    build:
+      context: ..
+      dockerfile: docker/Dockerfile.postgres
+    ports:
+      - "5432:5432"
+    environment:
+      POSTGRES_DB: openstreetmap