[VOL-5285] - JJB Upgrade toward v5

Makefile
--------
  o Added a repository makefile with convenience targets (make test)

chart_version_check.sh
-----------------------------------
  o Copyright notice updated to onf v1.1
  o More temp filename filtering added.
  o Improve reporting for a cryptic error source.
  o Version diffs rely on simple string comparison which can be
    confused by composite charts like voltha-infra/ and voltha-stack/
    when multiple chart versions are modified.
  o Yaml parsing needed for a real fix, in the interim identify the
    problem and display strings that contributed to detection.

chart_version_check/filter_files.sh
-----------------------------------
  o Added helper library filter_files().
  o Given a list of files return the list with garbage removed.

test/bats/chart_version_check.sh
--------------------------------
  o Added a bats unit test for filter_files().

Change-Id: I8d724579976adf62d47786fcad16d21d0759a5ab
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..53ca588
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,54 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2024 Open Networking Foundation 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.
+# -----------------------------------------------------------------------
+# SPDX-FileCopyrightText: 2024 Open Networking Foundation Contributors
+# SPDX-License-Identifier: Apache-2.0
+# -----------------------------------------------------------------------
+
+.DEFAULT_GOAL := help
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+all :
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+test ::
+  ifdef BATS
+	$(MAKE) -C test/bats $@
+  endif
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+clean ::
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+sterile :: clean
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+help ::
+	@echo 'Usage: $(MAKE) [options] [target] ...'
+
+	@printf '  %-33.33s %s\n' 'test' 'Run available test suites'
+	@printf '  %-33.33s %s\n' '  BATS=1' 'Launch bats test suites (WIP)'
+
+	@printf '\n[CLEAN]\n'
+	@printf '  %-33.33s %s\n' 'clean'   'Remove makefile generated targets'
+	@printf '  %-33.33s %s\n' 'sterile' 'Revert sandbox to a pristine state'
+
+# [EOF]