feat: Serve well-known assetlinks json

[Pytal]

Summary

• Resolve Associating website with Android app For Better DeepLink Support #44650

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[Pytal]

cc @alperozturk96 feel free to edit the assetlinks.json in the second commit

[alperozturk96]

cc @alperozturk96 feel free to edit the assetlinks.json in the second commit

We need to put "sha256_cert_fingerprints" please don't merge, until we put it. @tobiasKaminsky Can you edit assetlinks.json?

[kesselb]

package_name and sha256_cert_fingerprints should be configurable via config.php similar to https://github.com/nextcloud/server/blob/master/config/config.sample.php#L1105-L1123 for branded clients.

[Pytal]

package_name and sha256_cert_fingerprints should be configurable via config.php similar to master/config/config.sample.php#L1105-L1123 for branded clients.

Makes sense 👍

Would we need to allow multiple package_name and sha256_cert_fingerprints @tobiasKaminsky?

[tobiasKaminsky]

Would we need to allow multiple package_name and sha256_cert_fingerprints @tobiasKaminsky?

@alperozturk96 can you check if this is possible or needed?

[alperozturk96]

@Pytal assetlinks-json can contain multiple package names. @tobiasKaminsky as far as I can see we only have "com.nextcloud.client" this package name. Shouldn't be needed for another one.

Example