DOCKER: New development workflow using RabbitMQ

[ashiklom]

Description

Enable (and describe) a development workflow where the user mounts her local PEcAn source code as a volume onto the executor container, and then triggers workflow rebuilds using a special rebuild RabbitMQ message. This leverages the docker-compose.override.yml functionality, described here, to avoid having to edit any version-controlled files.

Motivation and Context

This should make it easier to develop and test with Docker.

Review Time Estimate

• Immediately
• Within one week
• When possible

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the CHANGELOG.md.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.