Add GitHub action to build GCPy environment and test installation #2

	---
	#
	# GitHub action to build the GCPy environment with micromamba
	# See: https://github.com/marketplace/actions/setup-micromamba
	#
	name: build-gcpy-environment

	on:
	push:
	branches: [ "main", "dev" ]
	pull_request:
	# The branches below must be a subset of the branches above
	branches: [ "main", "dev" ]

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ["3.9"]
	steps:
	- uses: mamba-org/setup-micromamba@v1.8.0
	with:
	micromamba-version: 'latest'
	environment-file: docs/source/environment.yml
	init-shell: bash
	cache-environment: true
	post-cleanup: 'all'
	- name: Activate the GCPy environment
	run: python -c "import gcpy"
	- name: Run custom command in micromamba environment
	run: python -m gcpy.examples.plotting.create_test_plot
	shell: bash -el {0}

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