Run CI on push to main

Author: hisapy

.github/workflows/terraform-ci.yml

@@ -2,7 +2,7 @@ name: Terraform CI
 
 on:
   push:
-    branches: [main, master]
+    branches: [main]
   pull_request:
     paths:
       - '**.tf'
@@ -19,6 +19,7 @@ jobs:
       - name: Set up Terraform
         uses: hashicorp/setup-terraform@v2
         with:
+          # TODO: read from .tool-versions
           terraform_version: 1.13.3
 
       - name: Terraform fmt (check)