security: Added example for HMAC-based NVS encr-keys protection scheme

examples/security/.build-test-rules.yml

@@ -5,3 +5,11 @@ examples/security/flash_encryption:
     - if: IDF_TARGET in ["esp32s2", "esp32s3", "esp32c6", "esp32h2", "esp32c2"]
       temporary: true
       reason: lack of runners
+
+examples/security/nvs_encryption_hmac:
+  disable:
+    - if: SOC_HMAC_SUPPORTED != 1
+  disable_test:
+    - if: IDF_TARGET not in ["esp32c3"]
+      temporary: true
+      reason: lack of runners