implement certificate posture check

shared/management/http/api/openapi.yml

@@ -1663,6 +1663,8 @@ components:
           $ref: '#/components/schemas/PeerNetworkRangeCheck'
         process_check:
           $ref: '#/components/schemas/ProcessCheck'
+        certificate_check:
+          $ref: '#/components/schemas/CertificateCheck'
     NBVersionCheck:
       description: Posture check for the version of NetBird
       type: object
@@ -1780,6 +1782,18 @@ components:
           description: Path to the process executable file in a Windows operating system
           type: string
           example: "C:\ProgramData\NetBird\netbird.exe"
+    CertificateCheck:
+      description: Posture check for a certificate held by the peer that chains to one of the given CA certificates
+      type: object
+      properties:
+        ca_certificates:
+          description: PEM encoded CA certificates the peer's certificate must chain to
+          type: array
+          items:
+            type: string
+          example: ["-----BEGIN CERTIFICATE-----\nMIIB...\n-----END CERTIFICATE-----"]
+      required:
+        - ca_certificates
     Location:
       description: Describe geographical location information
       type: object