Fix interpolation #148

Job	Run time
test-auto-nightly	1m 27s
test-generate	3s
test (ubuntu-latest, nightly)	1m 26s
test-auto-nightly-with-explicit	1m 33s
test (ubuntu-latest, lts)	1m 26s
test (ubuntu-latest, lts-22.7, 9.6.4)	1m 12s
test (ubuntu-latest, lts-20.2, 9.2.5)	1m 14s
test (ubuntu-latest, lts-19.33, 9.0.2)	1m 9s
test (ubuntu-latest, lts-18.28, 8.10.7)	1m 19s
test (ubuntu-latest, lts-16.31, 8.8.4)	1m 11s
test (ubuntu-latest, lts-12.26, 8.4.4)	1m 20s
test (macOS-latest, nightly)	3m 12s
test (macOS-latest, lts)	3m 19s
test (macOS-latest, lts-22.7, 9.6.4)	2m 53s
test (macOS-latest, lts-20.2, 9.2.5)	3m 0s
test (macOS-latest, lts-19.33, 9.0.2)	3m 22s
test (macOS-latest, lts-18.28, 8.10.7)	3m 11s
test (macOS-latest, lts-16.31, 8.8.4)	3m 11s
test (macOS-latest, lts-12.26, 8.4.4)	2m 32s
test (windows-latest, nightly)	3m 21s
test (windows-latest, lts)	3m 26s
test (windows-latest, lts-22.7, 9.6.4)	3m 25s
test (windows-latest, lts-20.2, 9.2.5)	3m 21s
test (windows-latest, lts-19.33, 9.0.2)	3m 16s
test (windows-latest, lts-18.28, 8.10.7)	3m 14s
test (windows-latest, lts-16.31, 8.8.4)	3m 14s
test (windows-latest, lts-12.26, 8.4.4)	3m 16s
test-stack-yamls (stack-nightly.yaml)	1m 24s
test-stack-yamls (stack.yaml)	1m 5s
	1h 7m 2s

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