fix mockery generation script (#9094) (#9114)

scripts/mockery_generate.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+#
+# Invoke Mockery v2 to update generated mocks for the given type.
+#
+# This script runs a locally-installed "mockery" if available, otherwise it
+# runs the published Docker container. This legerdemain is so that the CI build
+# and a local build can work off the same script.
+#
+if ! which mockery ; then
+  mockery() {
+    docker run --rm -v "$PWD":/w --workdir=/w vektra/mockery:v2.12.3
+  }
+fi
+
+mockery --disable-version-string --case underscore --name "$@"