ci: add a debug env step that always runs #1078

Job	Run time
debug-env	2s
fresh-macos-test (macos-15)	24m 15s
login-shells-and-linting	5m 53s
fresh-macos-test (macos-14)	24m 13s
container-test (ubuntu:latest)	11m 13s
fresh-macos-test (macos-12)	2m 26s
runner-test (ubuntu-24.04)	12m 12s
container-test (fedora:latest)	10m 55s
runner-test (ubuntu-22.04)	13m 33s
container-test (debian:latest)	10m 51s
runner-test (macos-15)	4s
container-test (alpine:latest)	11m 29s
runner-test (macos-14)	23m 24s
container-test (opensuse/leap)	14m 34s
container-test (opensuse/tumbleweed)	10m 53s
runner-test (macos-12)	35m 40s
container-test (kalilinux/kali-rolling)	11m 31s
	3h 43m 8s

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