feat: add support to use Google Application Default Credentials #224
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This PR adds support to rely on Google's Application Default Credentials, so you don't have to generate & provide a Service Account key.
This option is only useful when running Wordpress on Google Cloud - whether it's on AppEngine, Cloud Run, a Compute Instance or even on GKE (with Workload Identity enabled); and automatically uses the Service Account credentials that belong to the SA running the workload.