fix(): Check for existing output file

scripts/ziti-edge-router_install_rec.sh

@@ -10,4 +10,10 @@ fi
 INPUT_FILE=ziti-edge-router_install_script.sh
 OUTPUT_FILE=../casts/ziti-edge-router_install.cast
 
+# Check if $OUTPUT_FILE exists
+if [ -f $OUTPUT_FILE ]; then
+  echo "File $OUTPUT_FILE already exists. Exiting."
+  exit 1
+fi
+
 poetry run asciinema-automation -dt 75 -sd 30 --asciinema-arguments " --cols=238 --rows=56 " $INPUT_FILE $OUTPUT_FILE