Add the root key from a variable

.gitlab-ci.yml

@@ -21,6 +21,7 @@ build_tests:
 build_esp32_application:
   stage: build
   script:
+    - echo $WEBSERVER_ROOT_CERT | base64 -d -w 0 > main/doorcode_root_cert.cert
     - cp main/include/config.h.example main/include/config.h
     - /opt/esp/entrypoint.sh bash
     - idf.py build