fix: docker-publish.yml cosign command line args when multiple tags are present #1622
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With scheduled builds the output docker image has two tags - branch name (eg, main) and nightly.
The current template is passing these as a single argument into the cosign sign command. This is causing failures of the workflow when run with a scheduled trigger.
This change splits them using xargs and runs multiple cosign commands, one for each tag.
Tested by running against one of my own repos, eg: https://github.com/jamesmoore/mp3info/runs/7087514897?check_suite_focus=true#step:8:2