Updating git actions runner scripts

[darshan-sj]

I created the spanner-it git action runners recently and the scripts needed to be updated.

[gemini-code-assist]

Summary of Changes

Hello @darshan-sj, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on updating the underlying infrastructure and software configurations for the spanner-it GitHub Actions runners. The changes include increasing storage capacity and upgrading the operating system to a newer LTS version, alongside a critical adjustment to pin the Docker installation to an older version to ensure continued compatibility with existing integration tests that depend on specific Docker API versions.

Highlights

• Runner Disk Size Increase: The boot disk size for GitHub Actions runner instances has been increased from 200GB to 500GB.
• Operating System Upgrade: The base image for GitHub Actions runner instances has been upgraded from Ubuntu 20.04 LTS to Ubuntu 22.04 LTS.
• Docker Version Pinning: The Docker version installed on runner instances is now explicitly pinned to 20.10.24 to maintain compatibility with older testcontainers versions that rely on Docker API 1.32.
• Instance Naming Correction: A variable used for naming base instances in managed instance groups was corrected from BASE_NAME to RUNNER_NAME.

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[Abacn]

Not blocking this PR, can you provide which test container needs to be upgraded and if possible open PRs in Apache Beam repo, thanks!