Adding read-only permission to all jobs in the CI flow to ensure minimum required access #2577

Job	Run time
python_module_test_ubuntu_latest	35s
codespell	24s
copyright_check	7s
examples_clang-format	8s
examples_ubuntu-latest_g++_cxx14_relwithdebinfo_preview=OFF	3m 28s
ubuntu-latest_g++_cxx14_relwithdebinfo_preview=OFF	18m 53s
examples_ubuntu-20.04_g++_cxx17_release_preview=ON	3m 38s
examples_macos-12_clang++_cxx14_relwithdebinfo_preview=ON	5m 18s
ubuntu-20.04_g++_cxx17_release_preview=ON	16m 8s
macos-12_clang++_cxx14_relwithdebinfo_preview=ON	18m 34s
examples_ubuntu-20.04_g++-10_cxx20_debug_preview=ON	4m 12s
ubuntu-20.04_g++-10_cxx20_debug_preview=ON	12m 56s
windows_cl2019_cxx14_relwithdebinfo_preview=ON	14m 23s
examples_windows_cl2019_cxx14_relwithdebinfo_preview=ON	6m 5s
windows_cl2022_cxx17_relwithdebinfo_preview=OFF	13m 59s
examples_windows_cl2022_cxx17_relwithdebinfo_preview=OFF	5m 15s
documentation	1m 1s
pages	0s
	2h 5m 4s

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