Add more strict rules for security.txt

Previous one had a few false positives. This should narrow that down.

files/security.txt.yaml

@@ -10,6 +10,14 @@ requests:
     path:
       - "{{BaseURL}}/.well-known/security.txt"
     matchers:
+      - type: status
+        status:
+          - 200
       - type: word
         words:
           - "Contact:"
+        condition: and
+      - type: dsl
+        dsl:
+           - "len(body) <= 1024 && len(body) > 0"
+        condition: and