Add docker-compose dev

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

docker/entrypoint.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+mix deps.get
+
+# Wait for Postgres to become available.
+until PGPASSWORD=$POSTGRES_PASSWORD psql -h postgres -U "postgres" -c '\q' 2>/dev/null; do
+  >&2 echo "Postgres is unavailable - sleeping"
+  sleep 1
+done
+
+echo "\nPostgres is available: continuing with database setup..."
+
+# Potentially Set up the database
+mix ecto.create
+mix ecto.migrate
+
+echo "\nTesting the installation..."
+# "Proove" that install was successful by running the tests
+mix test
+
+echo "\n Launching Phoenix web server..."
+iex -S mix phx.server