Use ledger specifier to write agent key files #8069

Job	Run time
lock_check (ubuntu-latest, 3.10.9)	1m 19s
install_check (ubuntu-latest, 3.10.9)	35s
lock_check (macos-latest, 3.10.9)	2m 37s
linter_checks (ubuntu-latest, 3.10.9)	7m 21s
lock_check (windows-latest, 3.10.9)	4m 48s
copyright_doc_and_dependencies_check (ubuntu-latest, 3.10.9)	3m 3s
gitleaks	28s
e2e (ubuntu-latest, 3.10.9)	1h 28m 38s
test (ubuntu-latest, 3.8)	27m 29s
test (ubuntu-latest, 3.9)	28m 30s
test (ubuntu-latest, 3.10.9)	29m 8s
test (ubuntu-latest, 3.11)	27m 50s
test (macos-latest, 3.8)	20m 20s
test (macos-latest, 3.9)	15m 46s
test (macos-latest, 3.10.9)	15m 6s
test (macos-latest, 3.11)	18m 20s
test (windows-latest, 3.8)	19m 23s
test (windows-latest, 3.9)	18m 17s
test (windows-latest, 3.10.9)	19m 26s
test (windows-latest, 3.11)	21m 19s
	6h 9m 43s

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