Add ENABLE_INSTALL option to manage 'install' target #340

	name: amd64 MacOS CMake

	on:
	push:
	pull_request:
	schedule:
	# min hours day(month) month day(week)
	- cron: '0 0 7,22 * *'

	jobs:
	# Building using the github runner environement directly.
	xcode:
	runs-on: macos-latest
	env:
	CTEST_OUTPUT_ON_FAILURE: 1
	steps:
	- uses: actions/checkout@v2
	- name: Check cmake
	run: cmake --version
	- name: Configure
	run: cmake -S. -Bbuild -G "Xcode" -DCMAKE_CONFIGURATION_TYPES=Release
	- name: Build
	run: cmake --build build --config Release --target ALL_BUILD -v
	- name: Test
	run: cmake --build build --config Release --target RUN_TESTS -v
	- name: Install
	run: cmake --build build --config Release --target install -v
	make:
	runs-on: macos-latest
	env:
	CTEST_OUTPUT_ON_FAILURE: 1
	steps:
	- uses: actions/checkout@v2
	- name: Check cmake
	run: cmake --version
	- name: Configure
	run: cmake -S. -Bbuild -DCMAKE_BUILD_TYPE=Release
	- name: Build
	run: cmake --build build --target all -v
	- name: Test
	run: cmake --build build --target test -v
	- name: Install
	run: cmake --build build --target install -v

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