Determining if a GitHub Actions workflow was triggered by workflow_dispatch

TL;DR

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github.event_name == 'workflow_dispatch'

What is workflow_dispatch?

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Using GitHub Actions’ workflow_dispatch, you can manually trigger a defined Workflow.

For details, please read the official documentation.

docs.github.com

Determining if a GitHub Actions workflow was triggered by workflow_dispatch

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It might not be a common example, but I had a case where I wanted to determine if a Workflow was executed by workflow_dispatch. Roughly, the premise was like this:

• There is already a mechanism to create a tag and push it by commenting a specific string in a review on a PR from a release branch.
• I want to execute the above via workflow_dispatch as well.
• In the case of workflow_dispatch, I want to skip the “is it a release branch” check and tag it.

I wondered how to determine this, so I looked it up.

As mentioned at the beginning, you can determine if it’s an execution via workflow_dispatch by describing it as follows:

github.event_name == 'workflow_dispatch'

Bonus

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I wanted to judge multiple conditions in the yml file, so I investigated how to write that. As of 2021/04/11, it is not mentioned in the official documentation, but you can specify multiple lines of conditions by writing as follows:

if : |
    condition1
    condition2
    condition3

How to write multi-line condition in if - #2 by brightran - GitHub Actions - GitHub Support Community