Dockerfile for alpine and postgres base images

docker-entrypoint.sh

#!/bin/bash
set -e

export PGHOST=$DATABASE_HOST
export PGUSER=$DATABASE_USER
export PGPASSWORD=$DATABASE_PASSWORD

while ! pg_isready &> /dev/null; do
    sleep 1
    echo waiting postgres
done

DATABASE_NAME=projects
QUERY="SELECT 1 FROM pg_database WHERE datname = '$DATABASE_NAME'"

if ! (psql -tc "$QUERY" | grep -q 1); then
    echo creating database "$DATABASE_NAME"
    psql -c "CREATE DATABASE $DATABASE_NAME"
    # Make migrations
fi

$@

Dockerfile

FROM python:3-alpine

COPY requirements.txt .

RUN apk add --update \
    postgresql-libs \
    postgresql-client \
    && apk add --virtual \
    .build-deps \
    gcc \
    musl-dev \
    postgresql-dev \
    && python -m pip install -r requirements.txt --no-cache-dir \
    && apk --purge del .build-deps

COPY . .

ENTRYPOINT ["./docker-entrypoint.sh"]