not sure if its a single line you still need pipeline. but you are missing | on your lines for

- script: 
    swift package-registry login {myrepourl}/login --token mytoken
- script: 
    swift package-registry set --global {myrepourl}

while you have | for the other script lines. if its a single line i always put it next to the - script: element.

can you post logs for these two? it seems like you didnt properly login