sysbench: fix PostgreSQL git clone network connectivity issues

Add retry mechanism and shallow clone to handle intermittent network
failures during PostgreSQL repository cloning. The git clone was
failing with "RPC failed; curl 18 Transferred a partial file" errors
due to the large repository size and network timeouts.

Changes:
- Add depth: 1 for shallow clone to reduce transfer size
- Add retry logic (3 attempts with 5-second delays)
- Add proper success condition checking

This resolves sysbench workflow failures during PostgreSQL setup.

Generated-by: Claude AI
Signed-off-by: Daniel Gomez <[email protected]>

Author: dkruces

playbooks/roles/sysbench/tasks/postgresql-native/main.yaml

@@ -32,8 +32,13 @@
     dest: "{{ sysbench_postgresql_repo_path }}"
     update: true
     version: "{{ _sysbench_postgresql_ref.stdout }}"
+    depth: 1
   environment:
     GIT_SSL_NO_VERIFY: "true"
+  retries: 3
+  delay: 5
+  register: git_result
+  until: git_result is succeeded
 
 - name: Get number of processing units available
   tags: ["always"]