TODO items for jenkins

[reachjainrahul]

1. Figure out SSH private key addition
2. Avoid scping the code from jenkin slave to dynamic vm
3. Find a better way to pass credentials from jenkins to dynamic vm. Right now its command line argument
4. Add doc for CI
5. Evaluate if we can pass artifacts from one jenkins job to another. We want a build job and all the test jobs can access docker image from the build job
6. Evaluate if we can avoid dynamic VM and run test inside jenkins slave itself in docker (stretched goal)
7. Can we cancel jobs if a new trigger is issued. for example, if a job is running, and someone retriggers a new job in the same PR, it should cancel old job