Jenkins CI for running GPU tests for CI

[prigoyal]

creating this master task for people to track progress. I am actively working on this and will post updates here.

• Setup the dockerfiles repo where CI can pull docker build info from
• Setup a tensorcomp bot and add to this repo
• ssh setup for the tensorcomp bot on Jenkins CI
• Remove the tiering of the docker images Docker images improvement - non tiered version #79 done in Untiered docker images for easy Jenkins setup #91
• Groovy skeleton for TC CI https://github.com/pietern/ossci-job-dsl/pull/81
• setup the anonymous readability of jobs
• build docker and push to the nexus registry https://registry.pytorch.org/nexus/#browse/search/docker
• whitelist users for which to automatically kick off builds tc core team+some other external
• Docker version handling properly automatic handling is done
• Refactor and Install jenkins in docker filesRefactor dockerfiles and install jenkins user #122
• Refactor jenkins groovy scripts for Tensor Comprehensions with Ed
• setup the test in the docker build before pushing it to registry https://github.com/pietern/ossci-job-dsl/pull/85
• Add tensorcomp the the HUD for monitoring jobs Add tensorcomp links to the HUD pytorch/ci-hud#1
• Set tensorcomp docker cleanup job https://github.com/pietern/ossci-job-dsl/pull/93
• end to end testing of the docker build, push, tc build and test on Jenkins
• setup the sccache for the docker image building
• submit jenkins configuration and test configuration is correct
• test the PRs are triggering

[prigoyal]

Jenkins is functional now and is working fine. Bunch of PRs have been tested and merged. Closing out this master task now hence. For any follow-ups, we will create a separate task and address things.