chore: update repo semaphore project (#4338)

Co-authored-by: Confluent Jenkins Bot <[email protected]>

.semaphore/project_public.yml

@@ -0,0 +1,20 @@
+# This file is managed by ServiceBot plugin - Semaphore. The content in this file is created using a common
+# template and configurations in service.yml.
+# Modifications in this file will be overwritten by generated content in the nightly run.
+# For more information, please refer to the page:
+# https://confluentinc.atlassian.net/wiki/spaces/Foundations/pages/2871296194/Add+SemaphoreCI
+apiVersion: v1alpha
+kind: Project
+metadata:
+  name: librdkafka
+  description: ""
+spec:
+  visibility: private
+  repository:
+    url: [email protected]:confluentinc/librdkafka.git
+    pipeline_file: .semaphore/semaphore.yml
+    integration_type: github_app
+    status:
+      pipeline_files:
+      - path: .semaphore/semaphore.yml
+        level: pipeline