iPeer worker container failed to start

[kitsook]

When doing a fresh install with docker, the worker container won't start.

As defined in docker-compose.yml, the worker container is based on app image. It is missing the pdo_mysql extension that worker needs.

[xcompass]

This is fixed in 1f94e17. But now, with fresh installation, there is missing table error: Base table or view not found: 1146 Table 'ipeer.jobs' doesn't exist". Also the worker process should wait until database is up.

Suggested fix:

• Delay worker container until database is up.
• Create table if table doesn't exist in the worker process.