ci: update default branch name in ci

Author: lorenzocorallo

.github/workflows/terraform.yml

@@ -3,7 +3,7 @@ name: "Terraform"
 on:
   push:
     branches:
-      - main
+      - stable
   pull_request:
 
 
@@ -111,5 +111,5 @@ jobs:
       run: exit 1
 
     - name: Terraform Apply
-      if: github.ref == 'refs/heads/main' && github.event_name == 'push'
+      if: github.ref == 'refs/heads/stable' && github.event_name == 'push'
       run: terraform apply -auto-approve -input=false