Add Schema.org markup for images

[teolemon]

Problem

• Add Schema.org markup for images
• https://developers.google.com/search/docs/appearance/structured-data/image-license-metadata

Part of

• 🕷️ Indexation (tracker) #7583

[hangy]

FYI, we have some parts of this present

• https://github.com/openfoodfacts/openfoodfacts-server/blob/b2f9b1dd4962d19a3844680a793aad88473ee5eb/templates/web/pages/product/includes/product_image.tt.html

• openfoodfacts-server/conf/nginx.conf

  Line 56 in b2f9b1d

  add_header Link "<https://creativecommons.org/licenses/by-sa/3.0/>; rel='license'; title='CC-BY-SA 3.0'";

• openfoodfacts-server/templates/web/panels/image.tt.html

  Line 29 in b2f9b1d

  <meta itemprop="license" content="https://creativecommons.org/licenses/by-sa/3.0/">

[github-actions]

This issue is stale because it has been open 90 days with no activity.

[github-actions]

This issue has been open 90 days with no activity. Can you give it a little love by linking it to a parent issue, adding relevant labels and projets, creating a mockup if applicable, adding code pointers from https://github.com/openfoodfacts/openfoodfacts-server/blob/main/.github/labeler.yml, giving it a priority, editing the original issue to have a more comprehensive description… Thank you very much for your contribution to 🍊 Open Food Facts