installer: use main branch for chart discovery (#92)

Co-authored-by: Giorgi Lekveishvili <lekva@gl-mbp-m1-max.local>
diff --git a/core/installer/tasks/infra.go b/core/installer/tasks/infra.go
index cd7ad14..59bc986 100644
--- a/core/installer/tasks/infra.go
+++ b/core/installer/tasks/infra.go
@@ -82,7 +82,7 @@
   interval: 1m0s
   url: https://github.com/giolekva/pcloud
   ref:
-    branch: cuelang
+    branch: main
 `, env.Name)
 			if err != nil {
 				return err