Add dependabot config and g2g action

Github2Gerrit allows Dependabot to open PRs in Github, which are then
translated to Gerrit patches.

Signed-off-by: Eric Ball <eball@linuxfoundation.org>
Change-Id: I166dbaf29a53f16119e67bfb053ff2f2cfeb67e1
diff --git a/.github/workflows/gerrit-verify.yaml b/.github/workflows/gerrit-verify.yaml
index 6fa0602..26995db 100644
--- a/.github/workflows/gerrit-verify.yaml
+++ b/.github/workflows/gerrit-verify.yaml
@@ -1,4 +1,7 @@
 ---
+# SPDX-License-Identifier: Apache-2.0
+# Copyright 2026 The Linux Foundation
+
 name: Call Verify Workflow(s)
 
 # yamllint disable-line rule:truthy