Configure SAST in `.gitlab-ci.yml`, creating this file if it does not already exist

Configure SAST in .gitlab-ci.yml using the GitLab managed template. You can add variable overrides to customize SAST settings.

.gitlab-ci.yml

@@ -9,6 +9,7 @@ image: docker:20.10.17
 include:
 - template: Security/Container-Scanning.gitlab-ci.yml
 - template: Security/Secret-Detection.gitlab-ci.yml
+- template: Security/SAST.gitlab-ci.yml
 container_scanning:
   variables:
     DOCKER_IMAGE: "$CI_REGISTRY_IMAGE:$CI_COMMIT_BRANCH"
@@ -79,3 +80,7 @@ docker-build-16.0-alpine:
   - docker push "$CI_REGISTRY_IMAGE:16.0-alpine"
   only:
   - '16.0'
+stages:
+- test
+sast:
+  stage: test