src/cmd-remote-build-container: fix quay label in example
The label for tag expiration should be quay.expires-after
@@ -151,7 +151,7 @@ must be defined
Examples:
$ cosa remote-build-container \
--arch aarch64 \
- --label quay.labels-after=4d \
+ --label quay.expires-after=4d \
--git-ref main \
--git-url https://github.com/coreos/coreos-assembler.git \
--repo quay.io/coreos/coreos-assembler-staging \
