ci: GCP JWT script
Add GCP IdToken generator.
Needed environment variables:
OSDU_GCP_SA_FILE=<sa_file_content>
OSDU_GCP_AUDIENCE=<target_audience_of_sdms>
Add GCP IdToken generator.
Needed environment variables:
OSDU_GCP_SA_FILE=<sa_file_content>
OSDU_GCP_AUDIENCE=<target_audience_of_sdms>