Add support for strapi

Quick evaluation of strapi: vanilla node project, defaulting to sqlite3 via the better-sqlite3 npm module.. If sqlite3 is used, we will want to place that database on a volume, and set DATABASE_FILENAME. For pg and mysql, it appears that we will want to set DATABASE_CLIENT to postgres and mysql respectively.

The issue does not name a source file, test, or entry point. Start by locating how this Dockerfile generator handles Node applications and database environment variables, then compare the Strapi defaults for better-sqlite3, PostgreSQL, and MySQL. Done means Strapi is supported with the documented database settings and SQLite data can be placed on a volume.

Written by the indexing model from the issue text.