🤖 ci: use nix devshell PATH for mux bash hooks #149

Job	Run time
Codex Comments	34s
Detect changed paths	27s
Lint GitHub Actions	0s
test	0s
Terraform (fmt/validate/tflint/trivy)	0s
lint	0s
E2E Smoke (Kind)	0s
Publish GHCR :main	0s
	1m 1s

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