refactor(server): source build version from git tag

- Stamp version, channel and vendor into META-INF/build-info.properties
- Read build metadata at runtime from BuildProperties instead of expanded YAML
- Remove app.common placeholders from application.yaml
- Derive the OpenAPI info version from the packaged build version
- Point the OCI image source label at the GitHub repository
- Drop redundant repository blocks from settings.gradle.kts

server/src/main/resources/application.yaml

@@ -53,8 +53,3 @@ logging:
     org.hibernate:
       orm.connections.pooling: off
 
-app:
-  common:
-    version: ${appVersion}
-    channel: ${channel}
-    vendor: ${vendor}