Set .gitlab-ci.yml to enable or configure SAST

.gitlab-ci.yml

+# You can override the included template(s) by including variable overrides
+# See https://docs.gitlab.com/ee/user/application_security/sast/#customizing-the-sast-settings
+# Note that environment variables can be set in several places
+# See https://docs.gitlab.com/ee/ci/variables/#priority-of-environment-variables
+stages:
+- test
+sast:
+  stage: test
+include:
+- template: Security/SAST.gitlab-ci.yml