Only release on tags.

Author: josh-silvas

.github/workflows/release.yml

@@ -4,8 +4,8 @@ name: "Terraform Provider Release"
 # "v*" (e.g. v0.1.0) is created.
 on:
   push:
-    branches:
-      - "main"
+    tags:
+      - 'v*'
 
 # Releases need permissions to read and write the repository contents.
 # GitHub considers creating releases and uploading assets as writing contents.