.github/workflows: Enable workflow_dispatch events

[timflannagan]

Update the existing set of CI-related workflows and enable the workflow_dispatch functionality in order to have a first-class way of triggering a workflow manually without having to entertain previous workarounds, like opening a PR with an empty commit.

Signed-off-by: timflannagan timflannagan@gmail.com

[timflannagan]

I somehow missed this when this functionality was added - check https://github.blog/changelog/2020-07-06-github-actions-manual-triggers-with-workflow_dispatch/ for more information.

[timflannagan]

Just testing this out here before adding it to OLM.

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Here's the current UI without this event trigger added:

Here's a screenshot when I was playing around with it my fork: