Switch from mamba to conda in CI and start using libgl-devel to use O… #233

	name: C++ CI Workflow with conda-forge dependencies

	on:
	push:
	pull_request:
	schedule:
	# * is a special character in YAML so you have to quote this string
	# Execute a "nightly" build at 2 AM UTC
	- cron: '0 2 * * *'

	jobs:
	build:
	name: '[${{ matrix.os }}@${{ matrix.build_type }}@conda]'
	runs-on: ${{ matrix.os }}
	strategy:
	matrix:
	build_type: [Release]
	os: [ubuntu-latest, windows-2019, macos-latest]
	imgui: [conda, vendored]
	fail-fast: false

	steps:
	- uses: actions/checkout@v2

	- uses: conda-incubator/setup-miniconda@v3
	with:
	miniforge-version: latest

	- name: Dependencies
	shell: bash -l {0}
	run: \|
	# Compilation related dependencies
	conda install cmake compilers make ninja pkg-config
	# Actual dependencies
	conda install glew glfw yarp

	- name: Imgui
	if: contains(matrix.imgui, 'conda')
	shell: bash -l {0}
	run: \|
	conda install imgui

	- name: OpenGL [Linux]
	if: contains(matrix.os, 'ubuntu')
	shell: bash -l {0}
	run: \|
	# On linux we need to install libgl-devel
	conda install libgl-devel

	- name: Configure [Linux, macOS]
	if: contains(matrix.os, 'ubuntu') \|\| contains(matrix.os, 'macos')
	shell: bash -l {0}
	run: \|
	mkdir -p build
	cd build
	cmake -GNinja -DCMAKE_BUILD_TYPE=${{ matrix.build_type }} ..

	- name: Configure [Windows]
	if: contains(matrix.os, 'windows')
	shell: bash -l {0}
	run: \|
	mkdir -p build
	cd build
	cmake -G"Visual Studio 16 2019" -DCMAKE_BUILD_TYPE=${{ matrix.build_type }} ..

	- name: Build
	shell: bash -l {0}
	run: \|
	cd build
	cmake --build . --config ${{ matrix.build_type }}

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