Add "file_env" support, especially for Docker secrets #43
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This adds explicit support for the following:
REDMINE_DB_MYSQL_FILE
REDMINE_DB_POSTGRES_FILE
REDMINE_DB_PORT_FILE
REDMINE_DB_USERNAME_FILE
REDMINE_DB_PASSWORD_FILE
REDMINE_DB_DATABASE_FILE
REDMINE_DB_ENCODING_FILE
REDMINE_SECRET_KEY_BASE_FILE
See also docker-library/wordpress#186 and docker-library/postgres#225