This API is meant to run along with ScoreHub-App. See https://github.com/neonabuko/SongManager for further instructions.
If you still wish to run it by itself, you should at least connect it to a SQL Server database, configured as follows.
In the ScoreHub-API directory, run:
docker run --network songmanager-network -e "ACCEPT_EULA=Y" -e "MSSQL_SA_PASSWORD=Password@123" -p 5432:5432 -v ./songs:/var/opt/mssql/songs -v mssql_server:/var/opt/mssql -d --rm --name songmanager-database_c mcr.microsoft.com/mssql/server:latest
then:
dotnet run