fix: show Loki Helm install output on failure

ansible/roles/observability/tasks/main.yml

@@ -116,6 +116,16 @@
   failed_when: false
   changed_when: true
 
+- name: Show Loki Helm install output
+  debug:
+    msg: |
+      Helm install rc: {{ loki_install.rc }}
+      Helm install stdout:
+      {{ loki_install.stdout }}
+      Helm install stderr:
+      {{ loki_install.stderr }}
+  when: loki_install.rc != 0
+
 - name: Wait for Loki statefulset rollout
   command: kubectl -n {{ observability_namespace }} rollout status statefulset/loki --timeout=10m
   register: loki_rollout