ci: publish to ghcr.io/authzed, bump Debian 12->13 and Go 1.26.2->1.26.3 - #1

ci: publish to ghcr.io/authzed, bump Debian 12->13 and Go 1.26.2->1.26.3#1

gamefiend merged 2 commits into

mainauthzed/configmap-reload:mainfrom

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