Non-blocking action in case of null token

[manuelcoppotelli]

At the current stage, the action calls the Create a registration token for a repository so that it can create a secret for the container instance to register at boot.

However, if the API invokation fails (for whatever reason), the jq tool returns null as string, an the action keep going on.
As a consequence, it creates a container instance that keeps running indefinitely without never having the possibility to register as Action Runner.

Considering the implementation at

github-self-hosted-runner-azure-create-action/action.yml

Line 63 in 63534a0

https://api.github.com/repos/${{ github.repository }}/actions/runners/registration-token | jq ".token" -r)

An effective solution could be adding the -e flag so that jq exit with error code in case of missing token property:

            https://api.github.com/repos/${{ github.repository }}/actions/runners/registration-token | jq ".token" -re)

[pp-ps]

PR #5 is now merged, we will close the issue after some monitoring.