Fix the Docker configuration to work better

config/database.docker.yml

@@ -0,0 +1,46 @@
+#development:
+#  adapter: mysql2
+#  database: tracks_dev
+#  # set this if you are storing utf8 in your mysql database to handle strings
+#  # like "Réné". Not needed for sqlite. For PostgreSQL use encoding: unicode
+#  # encoding: utf8
+#  host: docker
+#  port: 3307
+#  username: tracks_dev
+#  password: FqUKMWPz5mh8UPhypZvq
+
+#development:
+#  adapter: postgresql
+#  database: tracks_dev
+#  # set this if you are storing utf8 in your mysql database to handle strings
+#  # like "Réné". Not needed for sqlite. For PostgreSQL use encoding: unicode
+#  # encoding: utf8
+#  host: docker
+#  port: 5432
+#  username: tracks_dev
+#  password: password
+
+#development:
+#  adapter: sqlite3
+#  database: db.sqlite
+
+#test:
+#  adapter: mysql2
+#  database: tracks_test
+#  # set this if you are storing utf8 in your mysql database to handle strings
+#  # like "Réné". Not needed for sqlite. For PostgreSQL use encoding: unicode
+#  # encoding: utf8
+#  host: docker
+#  port: 3307
+#  username: tracks_tst
+#  password: 9rMNV4y6RVcqmJTo2QoR
+
+# Production config is disabled by default
+#
+development:
+  adapter: <%= ENV.fetch('DATABASE_TYPE') %>
+  database: <%= ENV.fetch('DATABASE_NAME') %>
+  host: <%= ENV.fetch('DATABASE_HOST') %>
+  port: <%= ENV.fetch('DATABASE_PORT') %>
+  username: <%= ENV.fetch('DATABASE_USERNAME') %>
+  password: <%= ENV.fetch('DATABASE_PASSWORD') %>