Build all functions via script, push to 0.5 watchdog

sample-functions/AlpineFunction/Dockerfile

sample-functions/CaptainsIntent/Dockerfile

sample-functions/ChangeColorIntent/Dockerfile

sample-functions/DockerHubStats/Dockerfile

sample-functions/HostnameIntent/Dockerfile

sample-functions/MarkdownRender/Dockerfile

sample-functions/NodeInfo/Dockerfile

sample-functions/WebhookStash/Dockerfile

sample-functions/build_all.sh

sample-functions/catservice/Dockerfile