v2.10.2: image_digest input: default value does not match required RegEx pattern

Following #90 (closed), when including the component from version 2.10.2 on, an error is thrown:

Unable to create pipeline

gitlab.example.org/components/opentofu/validate-plan-apply@2.12.0: image_digest input: default value does not match required RegEx pattern

We include the component from a local git mirror and with:

include:
  - component: $CI_SERVER_FQDN/components/opentofu/validate-plan-apply@2.12.0
    inputs:
      # The version must currently be specified explicitly as an input,
      # to find the correctly associated images. # This can be removed
      # once https://gitlab.com/gitlab-org/gitlab/-/issues/438275 is solved.
      version: 2.12.0 # component version
      opentofu_version: 1.10.2
      root_dir: tofu/

image_digest is not set here.

The error is raised, because the default value ``, the empty string, does not validate, as the error says.

Is image_digest non-optional now and must be set?

A workaround can be to revert to the earlier v2.10.1.