commands: Pin version of prometheus-operator

Due to some dep weirdness, it was always pining to a very old version of
the prometheus-operator, we want at least v0.25.0, otherwise k8s imports
fight amongst each other.

Author: lilic

commands/operator-sdk/cmd/new.go

@@ -289,6 +289,7 @@ func pullDep() {
 	}
 	fmt.Fprintln(os.Stdout, "Run dep ensure ...")
 	execCmd(os.Stdout, dep, ensureCmd, "-v")
+	execCmd(os.Stdout, dep, ensureCmd, "-add github.com/coreos/prometheus-operator@^v0.25.0")
 	fmt.Fprintln(os.Stdout, "Run dep ensure done")
 }