Flexible Conda Dependencies

[sdc50]

• Fixes the install_tethys.sh script so the specified version of python is installed
• Avoids modifying the environment.yml file so the conda packages will have flexible dependencies
• Modifies some syntax in the codebase to be compatible with python=3.10

[sdc50]

I'm not sure how the python=3.10 tests were passing previously as we use this syntax:

tethys/tests/unit_tests/test_tethys_config/test_context_processors.py

Line 64 in da1d12a

now = dt.datetime.now(dt.UTC)

[sdc50]

I'm not sure how the python=3.10 tests were passing previously as we use this syntax:

It appears that the python version wasn't being set correctly in the test matrix previously: https://github.com/tethysplatform/tethys/actions/runs/11576539437/job/32285872638?pr=1107#step:4:264

The sed command to substitute the python version had a typo, so it wasn't actually pinning the python version.

The good news is that this PR fixes that! The bad news is that our code base is not currently compatible with python=3.10 like with thought.

[coveralls]

coverage: 100.0%. remained the same
when pulling ed58ee4 on flexible_conda_build
into 4267324 on main.

[sdc50]

It looks like all checks are passing with the current approach (create the environment with the original environment.yml file and then afterward install the correct version of python and django). However, when I did this locally (downgrading to python=3.10) it tried to install sqlalchemy=2 and also was going to downgrade tethys_dataset_services. I checked the test environment on GitHub Actions and it looks like it didn't do this, but I still think it prudent to modify the approach.

For both efficiency and stability I'm going to modify the contents of the environment.yml file, but rather than overwrite the original file, it will write it out to a new file. The new file will be used to create the test environment, but the original environment.yml file will remain unchanged so that it can be used to create the correct (flexible) dependencies for the conda package.

[gagelarsen]

Looks good to me.