add fre make create-dockerfile test

[rem1776]

Describe your changes

Adds a test file for create-dockerfile with any tests that don't involve building the image (those will come alongside some more run-fremake tests once I can get a small enough base image to fit).

One issue I had was the dockerfile command would fail if create-checkout wasn't called before it, so this PR also adds a line that will create the tmp directory if it needs to. Now you can technically run the create-dockerfile command before the checkout script and makefile are created. I'm not sure if thats a good thing so lmk if this should work differently.

Issue ticket number and link (if applicable)

#225

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

[singhd789]

Another good test to add would be to check if a linkline.sh script is created if container_addlibs are defined as well (the bit that happens in this if statement in makefilefre.py:

fre-cli/fre/make/gfdlfremake/makefilefre.py

Line 14 in a9730e0

if "tmp" in self.filePath:

)

[rem1776]

I tried adding this in, but it seems like the makefile creation function isn't run by create-dockerfile. Maybe I should add that to the create-makefile test with a different PR?

[singhd789]

Ahh yes yes, you're right. That script is created in the makefile step, then copied into the dockerfile in this tool. I agree, the creation of this file would be in the makefile test.

Hmm, if we did want to somehow eventually add a test for a successful dockerfile execute with container_addlibs defined, we'd probably need an example linkline script (that would work for whatever additional libraries we add in there), or something. Maybe a future test to think about 🤔