Go on the website, create a new product from there
Click on the image to change it, select an unsplash image
Save your product.
Beforer this commit, the image wasn't saved because the qweb field image
did not know what to do with /unsplash/ urls
After this commit, the image is saved on the product (or any object...)
OPW 1936191
closesodoo/odoo#31328