SPIFFE-GCP-PROXY | Unable to run spiffe proxy in on-prem server to connect GCP

[gitashif]

Hi

we are using https://github.com/GoogleCloudPlatform/professional-services/tree/main/tools/spiffe-gcp-proxy
to setup workload identity provider.
To attest on-prem workload and establish a connectivty to GCP to fetch tokens .

Unfortunately the steps are not clear w.r.t Spiffe-proxy installation and further steps on attesting workloads.

When I try to run the proxy binary with required parameters, it runs in background and I tried to fetch token using

$curl -v "http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/[email protected]/token" -H "Metadata-Flavor: Google"

It returns

Query:
1.How we know following steps are executed without errors

2.How to implement this entire setup in an automated way, like github action etc.,

Any help would be much appreciated!