cli: ignore `$PAGER` in environment #6827

Job	Run time
build (no git)	1m 26s
nix flake (ubuntu-24.04)	7m 39s
test (macos-x86_64)	8m 30s
check (zizmor)	42s
test (windows-aarch64)	18m 29s
check (Cargo.lock dependency count)	3s
test (linux-x86_64-gnu)	6m 11s
nix flake (macos-14)	10m 52s
check (protos)	1m 54s
test (linux-aarch64-gnu)	5m 39s
nix flake (ubuntu-24.04-arm)	7m 1s
test (macos-aarch64)	6m 12s
check (rustfmt)	19s
check (doctests)	3m 2s
check (codespell)	10s
check (cargo-deny, advisories)	28s
check (cargo-deny, licenses)	27s
check (cargo-deny, sources)	28s
check (cargo-deny, bans)	24s
check (clippy)	1m 38s
check (mkdocs)	13s
test (windows-x86_64)	14m 58s
check (latest mkdocs, optional)	7m 15s
required checks (merge queue)	0s
	1h 44m 0s

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