feat(common): created a common ci file for inclusion

this file is intended to be included by repos that haave this repo as a sub
module.

!21

.gitlab-ci_common.yaml

@@ -0,0 +1,13 @@
+variables:
+    JOB_ROOT_DIR: 'gitlab-ci'
+    GIT_SUBMODULE_STRATEGY: recursive
+
+
+stages:
+    - validation
+    - build
+    - prepare
+    - test
+    - release
+    - sync
+    - publish