Add presubmit test for single-instance deployment on GCP

[AlexBasinov]

This draft PR adds the ./presubmit_tests/single-instance-on-gcp.sh script to test its execution in a real OSS Prow job. The goal is to verify that the script runs as expected and has access to environment variables injected by Prow.

Once validated, the job and script will be finalized and always_run/skip_report Prow job parameters will be updated accordingly.

Note: This PR is not yet ready for review. It's intended solely for testing the Prow job behavior.

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AlexBasinov

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[AlexBasinov]

/test oracle-toolkit-install-single-instance-on-gcp

[AlexBasinov]

/test oracle-toolkit-install-single-instance-on-gcp

[AlexBasinov]

/test ?

[google-oss-prow]

@AlexBasinov: The following commands are available to trigger required jobs:

• /test oracle-toolkit-install-rac-on-bms
• /test oracle-toolkit-install-single-instance-on-bms
• /test oracle-toolkit-install-single-instance-on-gcp

Use /test all to run the following jobs that were automatically triggered:

• oracle-toolkit-install-rac-on-bms
• oracle-toolkit-install-single-instance-on-bms

In response to this:

/test ?

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[mfielding]

/test oracle-toolkit-install-single-instance-on-gcp

[AlexBasinov]

/test oracle-toolkit-install-single-instance-on-gcp