[develop] Make `get_obs` tasks day-dependent in workflow; other improvements and bug fixes #618

	name: Python Tests
	on:
	push:
	branches:
	- develop
	- 'release/*'
	pull_request:
	branches:
	- develop
	- 'release/*'
	workflow_dispatch:

	defaults:
	run:
	shell: bash -leo pipefail {0}

	jobs:
	srw_tests:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout repository
	uses: actions/checkout@v2

	- name: Install Micromamba and srw_app environment
	uses: mamba-org/setup-micromamba@v1
	with:
	environment-file: environment.yml
	environment-name: srw_app
	init-shell: bash
	cache-downloads: true
	cache-environment: true

	- name: Checkout externals
	run: \|
	./manage_externals/checkout_externals ufs-weather-model

	- name: Lint the python code
	run: \|
	micromamba activate srw_app
	export PYTHONPATH=$(pwd)/ush
	pylint --ignore-imports=yes tests/test_python/
	pylint ush/create_*.py
	pylint ush/generate_FV3LAM_wflow.py
	pylint ush/set_fv3nml*.py
	pylint ush/update_input_nml.py

	- name: Run python unittests
	run: \|
	# exclude test_retrieve_data that is tested in functional test
	micromamba activate srw_app
	export UNIT_TEST=True
	export PYTHONPATH=$(pwd)/ush
	python -m unittest -b tests/test_python/*.py

	- name: Run python functional tests
	run: \|
	micromamba activate srw_app
	export CI=true
	export PYTHONPATH=${PWD}/ush
	python3 -m unittest -b tests/test_python/test_retrieve_data.py

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