Add github action: "release

[copejon]

Which issue(s) this PR addresses:

Closes #313

Adds a github action to execute microshift releases. Removes the target parameter from release.sh as the action will always execute against main:HEAD.

[openshift-ci]

@copejon: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-openshift-conformance-sig-storage	3e0a6d3	link	false	/test e2e-openshift-conformance-sig-storage

Full PR test history. Your PR dashboard.

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[rootfs]

/lgtm

[openshift-ci]

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