Fix string quotes in release workflow #15

Job	Run time
lint	9s
base-images	18m 49s
app-images (nightly, pulp-minimal)	13m 53s
app-images (nightly, pulp)	27m 49s
app-images (nightly, galaxy-minimal)	8m 1s
app-images (nightly, galaxy)	9m 55s
app-images (stable, pulp-minimal)	11m 39s
app-images (stable, pulp)	26m 27s
app-images (stable, galaxy-minimal)	7m 50s
app-images (stable, galaxy)	9m 1s
	2h 13m 33s

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