add helpful env vars during shell + run (#1548) #161

Job	Run time
tests / auto-nix-install (ubuntu-latest)	47s
tests / golangci-lint (ubuntu-latest)	59s
tests / auto-nix-install (macos-latest)	3m 9s
tests / test (not-main, ubuntu-latest, project-tests, 2.12.0)	20m 45s
tests / golangci-lint (macos-latest)	1m 17s
tests / test-nix-versions (ubuntu-latest, 2.15.1)	1m 4s
tests / test (not-main, ubuntu-latest, project-tests, 2.17.0)	15m 27s
tests / test-nix-versions (ubuntu-latest, 2.16.1)	1m 6s
tests / Spell Check with Typos	31s
tests / test-nix-versions (ubuntu-latest, 2.17.0)	52s
tests / test (not-main, ubuntu-latest, project-tests-off, 2.12.0)	10m 40s
tests / test (not-main, ubuntu-latest, project-tests-off, 2.17.0)	7m 29s
tests / test-nix-versions (ubuntu-latest, 2.18.0)	57s
tests / test (not-main, macos-latest, project-tests-off, 2.12.0)	16m 10s
tests / test-nix-versions (macos-latest, 2.15.1)	2m 48s
tests / test (not-main, macos-latest, project-tests-off, 2.17.0)	12m 58s
tests / test-nix-versions (macos-latest, 2.16.1)	2m 41s
tests / test-nix-versions (macos-latest, 2.17.0)	2m 39s
tests / test-nix-versions (macos-latest, 2.18.0)	4m 32s
release	0s
edge	0s
	1h 46m 51s

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