Ship OVA via Github releases

[arm4b]

Related to https://github.com/StackStorm/ova/issues/104

The way we'll distribute OVA is via Github Releases.

On every new git tag (aka Github release) CircleCI will build and upload the artifact to respective Github release page.

It means we should also start versioning the OVA and add CHANGELOG.md for this repo which is a good thing.

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Resources for implementation

• https://medium.com/@jgautheron/publish-your-golang-binaries-in-github-with-circleci-e0b64cb21bf8
• https://jedkirby.com/blog/github-releases-with-circleci
• https://github.com/tcnksm/ghr