Upgrade CI runner: Ubuntu from 20.04 (EOL May 31, 2025) to 22.04 LTS

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Feature Request

Is your feature request related to a problem? Please describe.

CKB's CI runner OS is currently Ubuntu 20.04 LTS (Focal), which reached end of standard support on May 31, 2025. We should upgrade to Ubuntu 22.04 LTS (Jammy), which will receive standard support until April 2027.

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This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days.

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This issue was closed because it has been stalled for 5 days with no activity.