add option to skip .sif transfers and allow for relative mkmf template paths

[rem1776]

Describe your changes

Adds two features that make the code a bit more portable, should make it a lot easier to use fre-cli on systems that aren't gaea.

• relative mkmf template paths - if a filename is given for the mkmf template (ie. no / in the string), it'll use the copy of the given template file that is stored in this repository as a submodule.
• -nft/--no-format-transfer option for create-dockerfile and run-fremake. This removes the .sif file transfer step from the container build script.

Issue ticket number and link (if applicable)

#309

Checklist before requesting a review

• I ran my code
• I tried to make my code readable
• I tried to comment my code
• I wrote a new test, if applicable
• I wrote new instructions/documentation, if applicable
• I ran pytest and inspected it's output
• I ran pylint and attempted to implement some of it's feedback