gitlab-ci: Enable secret detection job

Signed-off-by: Vasilis Tsiligiannis <acinonyx@openwrt.gr>

.gitlab-ci.yml

@@ -19,6 +19,7 @@ include:
   - template: Container-Scanning.gitlab-ci.yml
   - template: Dependency-Scanning.gitlab-ci.yml
   - template: SAST.gitlab-ci.yml
+  - template: Secret-Detection.gitlab-ci.yml
 container_scanning:
   stage: security
   variables:
@@ -38,6 +39,10 @@ gemnasium-python-dependency_scanning:
     - apt-get -qy install libmariadb-dev python3-pil libjpeg-dev
 sast:
   stage: security
+secret_detection:
+  stage: security
+secret_detection_default_branch:
+  stage: security
 schema:
   stage: schema
   image: ${GITLAB_CI_IMAGE_PYTHON}