feat(ci): add Gitleaks job for secret scanning

Signed-off-by: Klagarge <remi@heredero.ch>

.gitlab-ci.yml

@@ -97,3 +97,11 @@ dast:
     - echo "Waiting for the app to start on http://app:5000"
     - timeout 60 bash -c 'until curl -s http://app:5000; do echo "Waiting..."; sleep 3; done'
     - zap-full-scan.py -t http://app:5000 -I
+
+gitleaks:
+  stage: test
+  image:
+    name: zricethezav/gitleaks:latest
+    entrypoint: [""]
+  script:
+      - gitleaks dir -v --redact=75 .