feat: Remove travis scripts and add github actions for release purpose

[flacatus]

Signed-off-by: Flavius Lacatusu flacatus@redhat.com

What does this PR do?

Remove travis scripts and add github actions to release stable and next versions of chectl.

Refference issue:eclipse-che/che#18260

Screenshot/screencast of this PR

What issues does this PR fix or reference?

How to test this PR?

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

Reviewers

Reviewers, please comment how you tested the PR when approving it.

[flacatus]

I'm testing this changes agains my fork and releases looks identical: https://github.com/flacatus/chectl
Next release: https://github.com/flacatus/chectl/releases/tag/20201214203352
Stable release: https://github.com/flacatus/chectl/releases/tag/20201214200047

[nickboldt]

LGTM but I didn't run this. Deferring to others for final say. +0.1

[flacatus]

@nickboldt https://github.com/flacatus/chectl/releases
You can try in my fork

[benoitf]

Should it be author that perform the release ?

[benoitf]

let's try

[openshift-ci-robot]

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This pull-request has been approved by: benoitf, flacatus, nickboldt, tolusha
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