spike: Test Linux Docker init container Azure-nr integration with Node

[mrickard]

Description

The New Relic Azure Site Extension for Node allows easy installation of the agent on Windows webapps in Azure. There's no equivalent feature in Azure for Linux, but some teams are experimenting with init containers for containerized Linux apps.

Based on the spike done by Python, the Node agent should adapt that solution for Node. This spike is to test feasibility.

Acceptance Criteria

The outcome of this spike should be

• a running example (can be shut down after verification)
• a set of instructions for implementation
• issues for follow-on work

[workato-integration[bot]]

https://new-relic.atlassian.net/browse/NR-315026

[mrickard]

Bumped to 8 points due to the four (five, really) scenarios being tested