VOL-5160 - Repo triage build for release branching.

Makefile
makefiles
---------
  o Copy in library makefiles from repo:onf-make.
  o Selectively enable constants and library logic.
  o Cleanup and refactoring effort is needed to enable bulk docker and lint
    targets but that effort is deferred to a separate jira ticket.

VERSION
-------
  o Change *-dev branch to a release version to exercise all pipeline
    job steps (including task publish if any).

build/package/Dockerfile
cmd/bbsim-sadis-server.go
deployments/bbsim-sadis-server.yaml
internal/core/common.go
internal/core/sadis_if.go
internal/core/server.go
internal/core/store.go
internal/core/store_test.go
internal/core/watcher.go
internal/utils/config.go
internal/utils/utils.go
-----------------------
  o Update copyright notice.

Change-Id: I86c89354cb62eda41971bc2c00603d1894977d5c
diff --git a/makefiles/git/required.mk b/makefiles/git/required.mk
new file mode 100644
index 0000000..44f498d
--- /dev/null
+++ b/makefiles/git/required.mk
@@ -0,0 +1,32 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+# Intent: Conditionally load when named targets are requested.
+#   var ?= $(error ...) definitions are fatal to "make help" and others
+# -----------------------------------------------------------------------
+
+git-mk-targets := $(NULL)
+git-mk-targets := show-submodules
+
+# -----------------------------------------------------------------------
+# Define a flag to only load release targets when mentioned by name
+# Makefile can also explicitly define the flag to force always loading.
+# -----------------------------------------------------------------------
+$(foreach tgt,$(git-mk-targets),\
+  $(if $(findstring $(tgt),$(MAKECMDGOALS)),$(eval USE-ONF-GIT-MK := true))\
+)
+
+# [EOF]