Fix interpolation #144

Job	Run time
test-auto-nightly-with-explicit	25s
test-auto-nightly	24s
test-generate	4s
test (ubuntu-latest, nightly)	21s
test (ubuntu-latest, lts)	23s
test (ubuntu-latest, lts-22.7, 9.6.4)	20s
test (ubuntu-latest, lts-20.2, 9.2.5)	20s
test (ubuntu-latest, lts-19.33, 9.0.2)	21s
test (ubuntu-latest, lts-18.28, 8.10.7)	22s
test (ubuntu-latest, lts-16.31, 8.8.4)	23s
test (ubuntu-latest, lts-12.26, 8.4.4)	21s
test (macOS-latest, nightly)	1s
test (macOS-latest, lts)	1s
test (macOS-latest, lts-22.7, 9.6.4)	6s
test (macOS-latest, lts-20.2, 9.2.5)	3s
test (macOS-latest, lts-19.33, 9.0.2)	1s
test (macOS-latest, lts-18.28, 8.10.7)	23s
test (macOS-latest, lts-16.31, 8.8.4)	3s
test (macOS-latest, lts-12.26, 8.4.4)	23s
test (windows-latest, nightly)	7s
test (windows-latest, lts)	10s
test (windows-latest, lts-22.7, 9.6.4)	7s
test (windows-latest, lts-20.2, 9.2.5)	7s
test (windows-latest, lts-19.33, 9.0.2)	8s
test (windows-latest, lts-18.28, 8.10.7)	5m 4s
test (windows-latest, lts-16.31, 8.8.4)	8s
test (windows-latest, lts-12.26, 8.4.4)	2s
test-stack-yamls (stack-nightly.yaml)	1s
test-stack-yamls (stack.yaml)	1s
	10m 40s

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