ci: prevent s3 files being overwritten

If a released binary has been uploaded to S3, it should be prevented from being overwritten. If it
is being overwritten, it could very well be suggestive of a mistake somewhere. If you really want to
intentionally overwrite the file for some reason, remove it from the S3 bucket manually, then run
the workflow again.

Justfile

@@ -378,7 +378,14 @@ upload-release-assets-to-s3 bin_name:
 
   cd deploy/{{bin_name}}
   for file in *.zip *.tar.gz; do
-    aws s3 cp "$file" "s3://$bucket/$file" --acl public-read
+    dest="s3://$bucket/$file"
+    if aws s3 ls "$dest" > /dev/null 2>&1; then
+      echo "$dest already exists. This suggests an error somewhere."
+      echo "If you intentionally want to overwrite, remove the file and run the workflow again."
+      exit 1
+    else
+      aws s3 cp "$file" "$dest" --acl public-read
+    fi
   done
 
 node-man-integration-tests:

test.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+BUCKET_NAME="your-bucket-name"
+DESTINATION_PATH="s3://nat-detection/nat-detection-0.1.0-aarch64-unknown-linux-musl.zip"
+LOCAL_FILE_PATH="path/to/local/file"
+
+if aws s3 ls "$DESTINATION_PATH" > /dev/null 2>&1; then
+    echo "Error: Destination file already exists in the bucket."
+    exit 1
+else
+    echo "will upload"
+fi