Ignore markdown and txt files in CI #103

Job	Run time
build-on-windows (windows-debug)	41s
build-on-linux (linux-kvm-debug)	53s
build-on-windows (windows-release)	49s
build-on-linux (linux-kvm-release)	51s
build-on-linux (linux-hyperv-debug)	58s
build-on-linux (linux-hyperv-release)	57s
fuzzing / fuzz	9m 49s
rust / build (windows-2022-debug-amd)	16m 6s
rust / build (linux-kvm-debug-amd)	10m 4s
rust / build (linux-hyperv-debug-amd)	10m 11s
rust / build (windows-2022-release-amd)	20m 39s
rust / build (linux-kvm-release-amd)	13m 44s
rust / build (linux-hyperv-release-amd)	13m 58s
rust / build (windows-2022-debug-intel)	15m 24s
rust / build (linux-kvm-debug-intel)	9m 20s
rust / build (linux-hyperv-debug-intel)	9m 37s
rust / build (windows-2022-release-intel)	19m 21s
rust / build (linux-kvm-release-intel)	12m 56s
rust / build (linux-hyperv-release-intel)	13m 10s
	2h 59m 28s

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