Description: Use go generate to avoid depending on special make rules in
    debian/rules; this allows the CI pipeline in salsa to test the package
    properly.
--- /dev/null
+++ b/go/generate.go
@@ -0,0 +1,3 @@
+package io_prometheus_client
+
+//go:generate protoc --proto_path=.. --go_out=. ../metrics.proto