ci(preview-action): add ignore-errors input (#466)

The new input allows to build and deploy the PR preview but also to
validate xref.
Currently, this is needed for documentation component that have no xref
to other components. See
bonitasoft/bonita-labs-doc#139
In the future, when `Antora Atlas` will be used (#326), all
documentation content repositories will progressively do xref validation
as part of the preview build.

.github/actions/build-and-publish-pr-preview/action.yml

@@ -20,6 +20,10 @@ inputs:
     description: 'The name of the component to build. If set, the build-preview-command input is ignored'
     required: false
     default: ''
+  ignore-errors:
+    description: 'Only applies when the `component-name` input is set. If `true`, ignores Antora error.'
+    required: false
+    default: 'true'
 
 runs:
   using: "composite"
@@ -40,7 +44,7 @@ runs:
     - name: Build Site without error check
       if: github.event.action != 'closed' && inputs.component-name != ''
       shell: bash
-      run: ./build-preview.bash --component ${{inputs.component-name}} --branch ${{ github.head_ref }} --ignore-error true --fetch-sources true --pr "${{ github.event.pull_request.number }}" --site-url "${{ steps.surge-preview-tools.outputs.preview-url }}"
+      run: ./build-preview.bash --component ${{inputs.component-name}} --branch ${{ github.head_ref }} --ignore-error ${{inputs.ignore-errors}} --fetch-sources true --pr "${{ github.event.pull_request.number }}" --site-url "${{ steps.surge-preview-tools.outputs.preview-url }}"
     - name: Build Site
       if: github.event.action != 'closed' && inputs.component-name == ''
       shell: bash