Switch to micromamba #125

	name: Build Sycomore
	on: push

	jobs:
	build:
	runs-on: ${{ matrix.os }}
	name: ${{ matrix.os }}
	strategy:
	fail-fast: false
	matrix:
	include:
	- { os: "ubuntu-latest", packaging: "conda", python: "python" }
	- { os: "macos-latest", packaging: "conda", python: "python" }
	- { os: "windows-latest", packaging: "conda", python: "python" }
	env:
	WORKSPACE: "${{ github.workspace }}"
	defaults:
	run:
	shell: bash -l {0}
	steps:
	- uses: mamba-org/setup-micromamba@v1
	with:
	init-shell: bash powershell
	if: ${{ matrix.packaging == 'conda' }}

	- name: Checkout latest revision
	# Only the latest revision is required, as later steps do not depend on
	# tags.
	run: \|
	git config --global init.defaultBranch master
	git config --global --add safe.directory '*'
	git init .
	git remote add origin ${{ github.server_url }}/${{ github.repository }}
	git fetch origin --depth=1 ${{ github.ref }}
	git checkout ${{ github.ref_name }}

	- name: Set-up (${{ matrix.packaging }})
	run: ${{ matrix.python }} .ci/build/${{ matrix.packaging }}.py micromamba
	if: ${{ matrix.packaging == 'conda' }}

	- name: Set-up (${{ matrix.packaging }})
	run: ${{ matrix.python }} .ci/build/${{ matrix.packaging }}.py
	if: ${{ matrix.packaging != 'conda' }}

	- name: Build sycomore
	run: ${{ matrix.python }} ./.ci/build/build.py

	- name: Run tests
	run: ${{ matrix.python }} ./.ci/build/post_build.py

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