added heart_twin with devops workflows for gitlab

[pranjayyelkotwar]

This PR seeks to merge the heart DT with devops workflows using a shell based gitlab runner with the devops branch of dtaas examples

[prasadtalasila]

@pranjayyelkotwar The code is giving the following error.

Uploading artifacts for successful job
Uploading artifacts...
Runtime platform                                    arch=amd64 os=linux pid=2305675 revision=bbf75488 version=17.9.1
digital_twins/heart_dt/.venv: found 13056 matching artifact files and directories 
ERROR: Uploading artifacts as "archive" to coordinator... 413 Request Entity Too Large  id=6519 responseStatus=413 Request Entity Too Large status=413 token=64_dbTyPr
FATAL: too large                                   
Cleaning up project directory and file based variables
ERROR: Job failed: exit status 1

In addition, please update this PR with the updates done in the PR #58

[prasadtalasila]

Also the docker executor does not have default port mapping. How does the application become visible on the localhost?

[pranjayyelkotwar]

Two new directories have been added in this PR , heart_dt and heart_dt_paas where heart_dt has two yml files , one for shell based execution and one for docker based execution. Detailed documentation for this is is given in the devops.md file .

heart_dt_pass uses the exact same code but is meant for the deployment of the twin on render.com , documentation is provided in devops.md file. The yml file for this twin , on execution will mirror repo contents to a github repo which is connected to render.com which will deploy the digital twin