The nixpkgs-unstable channel's programs.sqlite was used to identify
packages producing exactly one binary, and these automatically added
to their package definitions wherever possible.
Additionally, we now force Java 11. While Ballerina documentation says to use
“Java 11 or above”, comments on GitHub indicate that Java 17 is currently
unsupported.
Using Ballerina 2201.2.1 on Java 17 yields me a ConcurrentModificationException
arising from the Ballerina compiler when compiling a simple test service. This
exception is avoided when running Ballerina on Java 11 instead.
