set up workflow to install plugins

[BionIT]

Signed-off-by: Lu Yu nluyu@amazon.com

Description

This change

• creates a new github action workflow to be triggered manually at this moment but subject to change when we have UI integration, the workflow inserts settings into addition config to be inserted into the configuration yaml file, and also gets plugins to be installed from github settings and builds and push docker image based on contents within the config/playground/docker/dev folder. The docker credentials, repo and tags are passed from secrets stored in github
• creates a custom_osd_entry script to be used to override the cmd of the official image
• adds custom dockerfile using latest official image as base image - this can be improved once we have UI integration to allow users to select which base image to use
• creates a install-plugins script to install plugins based on arguments
• removed config which will override whatever changes we made at this moment, and we can't expose the tracking id config in the yaml due to sensitivity of the data, thus the tracking id is written into the yaml on demand

Issues Resolved

#86

Check List

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[seraphjiang]

Suggested change

	with open(target_file, "r") as t:
	with open(TARGET_FILE, "r") as t:

[BionIT]

Yeah, changed to use uppercase for constants in new commit