ci: Add SSH key env debug logging

Author: imaNNeo

.github/workflows/deploy.yml

@@ -38,15 +38,15 @@ jobs:
           mkdir -p "$SSH_PATH"
           touch "$SSH_PATH/known_hosts"
 
-          echo "$PRIVATE_KEY" > "$SSH_PATH/id_rsa"
+          echo "--- Debug: env var length ---"
+          echo "${#PRIVATE_KEY} characters"
+          echo "--- Debug: line count ---"
+          echo "$PRIVATE_KEY" | wc -l
 
-          echo "--- Debug: key file size ---"
+          printf "%s\n" "$PRIVATE_KEY" > "$SSH_PATH/id_rsa"
+
+          echo "--- Debug: file size ---"
           wc -c "$SSH_PATH/id_rsa"
-          echo "--- Debug: first/last lines ---"
-          head -1 "$SSH_PATH/id_rsa"
-          tail -1 "$SSH_PATH/id_rsa"
-          echo "--- Debug: file type ---"
-          file "$SSH_PATH/id_rsa"
 
           chmod 700 "$SSH_PATH"
           ssh-keyscan github.com >> ~/.ssh/known_hosts