chore: update nightly samples cfg to include secret keys (#947)

* update nightly samples cfg to include secret keys

* added owlbot ignore

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* added secret key

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

java-securitycenter/.kokoro/nightly/samples.cfg

@@ -29,7 +29,7 @@ env_vars: {
 
 env_vars: {
   key: "SECRET_MANAGER_KEYS"
-  value: "java-docs-samples-service-account"
+  value: "java-docs-samples-service-account,java-scc-samples-secrets"
 }
 
 env_vars: {

java-securitycenter/owlbot.py

@@ -66,5 +66,6 @@
 s.remove_staging_dirs()
 
 java.common_templates(excludes=[
-    '.kokoro/presubmit/samples.cfg'
+    '.kokoro/presubmit/samples.cfg',
+    '.kokoro/nightly/samples.cfg'
 ])