new-server template: fix the task list

.gitlab/issue_templates/new-server.md

@@ -10,9 +10,10 @@ Summary:
 - Internal IP(s): xxx.xxx.xxx.xxx
 - Internal DNS name(s): xxx.internal.(softwareheritage.org|<environment>.swh.network
 
-[ ] Declare the servers in the [inventory](https://inventory.softwareheritage.org)
-[ ]  Add the management info in the credential store
-[ ] Install the OS
-[ ] Add puppet configuration (if needed)
-[ ] Configure firewall rules (if needed)
-[ ] <other actions if needed>
+Tasks:
+- [ ] Declare the servers in the [inventory](https://inventory.softwareheritage.org)
+- [ ]  Add the management info in the credential store
+- [ ] Install the OS
+- [ ] Add puppet configuration (if needed)
+- [ ] Configure firewall rules (if needed)
+- [ ] <other actions if needed>