While the "skipFeatureDeployment" option in package-solution.json works for me as documented and expected for SharePoint Online, I encounter an issue when trying to deploy the same app (which uses AzureCDN) with the same settings to SharePoint Server 2019.
On SharePoint Server 2019, uploading to an app catalogue still works without any issue (see example below). However, the app is then not listed under "Apps You Can Add" for deployment to a site, hence there is no apparent way to make a Framework app available by manual site deployment. Interestingly, implicit/automatic site deployment with "skipFeatureDeployment" set to true works just fine (but is not always a viable option).
Any ideas anyone?