Don't allow concurrent runs of scheduled + interactive workflows #559

Job	Run time
sanity	23s
unittests	10s
focal-x64, broken / build debs	2m 57s
jammy-arm64, good, timeout=4 / build debs	4m 19s
focal-x64, broken, cont-on-err / build debs	5m 32s
bookworm-x64, good, verbose=bloom / build debs	5m 53s
jammy-x64, good / build debs	7m 35s
noble-x64, good, verbose=true / build debs	8m 37s
bookworm squash / deploy	0s
jammy push / deploy	0s
	35m 26s

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