`fre make dockerfile` createContainer.sh script is not write when using `--execute`option

[singhd789]

Describe the bug
The createContainer script is not complete when using the --execute option with fre make dockerfile ... --execute option.

However, when not passing --execute, it seems to complete.

To Reproduce

1. fre make checkout-script ...
2. fre make makefile ...
3. fre make dockerfile ... --execute

createContainer.sh only has the first podman build step

Expected behavior
There should be 4 lines of code in the script:

• podman build ...
• rm ...
• podman save ...
• apptainer build