CI: Improve trigger files on Markdown action #13425

Job	Run time
Check POSIX-compliant	20s
Windows Server 2019, Erlang/OTP 27.3	8m 23s
Windows Server 2019, Erlang/OTP 28.1	7m 3s
Windows Server 2019, Erlang/OTP 26.2	6m 49s
Check Licence Compliance	8m 34s
Ubuntu 24.04, Erlang/OTP 28.1	5m 48s
Ubuntu 24.04, Erlang/OTP 28.1 (deterministic)	6m 9s
Ubuntu 24.04, Erlang/OTP 27.3	4m 58s
Ubuntu 24.04, Erlang/OTP 27.0	5m 5s
Ubuntu 24.04, Erlang/OTP 28.1 (coverage)	7m 15s
Ubuntu 24.04, Erlang/OTP master	5m 33s
Ubuntu 24.04, Erlang/OTP 26.0	5m 2s
Ubuntu 24.04, Erlang/OTP maint	4m 54s
	1h 15m 53s

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