Use non-stable release by default
Use non-stable release by default

This only matters for the examples-orms CI. During CockroachDB CI, a
path to the binary under test is passed as an env var and that is used.

cockroachdb/examples-orms,cockroachdb/examples-orms,cockroachdb/examples-orms,cockroachdb/examples-orms,cockroachdb/examples-orms,cockroachdb/examples-orms,cockroachdb/examples-orms