Enable retry-all-errors by default (#23)

## Summary
- Changes the default value of `retry-all-errors` from `false` to `true`
- Updates description to clarify it applies to downloading the chainctl
binary
- Makes the action more resilient to transient download failures by
default

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-authored-by: Claude <noreply@anthropic.com>

Author: imjasonh

action.yaml

@@ -60,9 +60,9 @@ inputs:
 
   retry-all-errors:
     description: |
-      Whether to retry on all errors.
+      Whether to retry on errors downloading the chainctl binary.
     required: false
-    default: false
+    default: true
 
 runs:
   using: "composite"