chore: Add missing secret

Author: mvicknr

.github/workflows/agent_metadata.yml

@@ -44,6 +44,8 @@ on:
         required: true
       FC_SYS_ID_PR_KEY:
         required: true
+      APM_CONTROL_NR_LICENSE_KEY_STAGING:
+        required: false
 
 jobs:
   send-agent-metadata:
@@ -55,3 +57,4 @@ jobs:
     secrets:
       FC_SYS_ID_CLIENT_ID: ${{ secrets.FC_SYS_ID_CLIENT_ID }}
       FC_SYS_ID_PR_KEY: ${{ secrets.FC_SYS_ID_PR_KEY }}
+      APM_CONTROL_NR_LICENSE_KEY_STAGING: ${{ secrets.APM_CONTROL_NR_LICENSE_KEY_STAGING }}  # action app is instrumented and supported by APM Control team