ci: skip redundant image publishes (#94) #405

Job	Run time
mutation	1m 35s
security	23s
cargo-deny (advisories + licenses)	22s
lint	1m 15s
test (ubuntu-latest)	1m 29s
version	3s
test (macos-latest)	1m 34s
test (windows-latest)	2m 57s
Coverage (llvm-cov)	1m 26s
	11m 4s

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