Chore(actions): Add GitHub actions inplace of travis and fix lint failure

Signed-off-by: udit udit@chaosnative.com What this PR does / why we need it:

Add GitHub actions in place of travis and fix the current lint failure

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Checklist

[ ] Does this PR have a corresponding GitHub issue?
[ ] Have you included relevant README for the chaoslib/experiment with details?
[ ] Have you added debug messages where necessary?
[ ] Have you added task comments where necessary?
[ ] Have you tested the changes for possible failure conditions?
[ ] Have you provided the positive & negative test logs for the litmusbook execution?
[ ] Does the litmusbook ensure idempotency of cluster state?, i.e., is cluster restored to original state?
[ ] Have you used non-shell/command modules for Kubernetes tasks?
[ ] Have you (jinja) templatized custom scripts that is run by the litmusbook, if any?
[ ] Have you (jinja) templatized Kubernetes deployment manifests used by the litmusbook, if any?
[ ] Have you reused/created util functions instead of repeating tasks in the litmusbook?
[ ] Do the artifacts follow the appropriate directory structure?
[ ] Have you isolated storage (eg: OpenEBS) specific implementations, checks?
[ ] Have you isolated platform (eg: baremetal kubeadm/openshift/aws/gcloud) specific implementations, checks?
[ ] Are the ansible facts well defined? Is the scope explicitly set for playbook & included utils?
[ ] Have you ensured minimum/careful usage of shell utilities (awk, grep, sed, cut, xargs etc.,)?
[ ] Can the limtusbook be executed both from within & outside a container (configurable paths, no hardcode)?
[ ] Can you suggest the minimal resource requirements for the litmusbook execution?
[ ] Does the litmusbook job artifact carry comments/default options/range for the ENV tunables?
[ ] Has the litmusbooks been linted?

Special notes for your reviewer:

@ksatchit please set the DNAME and DPASS secret in the repo and remove the Travis as a mandatory check.
Tested Runs:
- For push: https://github.com/uditgaurav/test-litmus-ansible/actions/runs/933491935
- For release: https://github.com/uditgaurav/test-litmus-ansible/actions/runs/933524145

litmuschaos / litmus-ansible

Chore(actions): Add GitHub actions inplace of travis and fix lint failure #28