Use recommended 'inputs' context in github workflows

[luolanzone]

Use recommended 'inputs' context in github workflows to fix the if condition check.

[antoninbas]

The recommended approach nowadays is to use the "unified" inputs context. See https://docs.github.com/en/actions/learn-github-actions/contexts#inputs-context. It replaces github.event.inputs, where all the input values were actually strings.

So if: ${{ github.event.inputs.push }} becomes if: ${{ inputs.push }}

I see that conformance.yml already uses the inputs context, we just need to update docker_update_base_windows.yml and trivy_scan.yml.

[antoninbas]

LGTM, thanks

[antoninbas]

/skip-all