Replace self-hosted runners with Ubicloud

[ikhoon]

Motivation:

The self-hosted runners installed on AWS can't scale out automatically and the price of EC2 is more expensive than Ubicloud runners

Additionally, the official self-hosted runners do not support the Docker environment so Ubicloud runners are safer and less vulnerable.

Modifications:

• Fixed Actions workflow files to use ubicloud-standard-8 which is almost the same spec with EC2 instances.

Result:

• Better CI environments.

[github-actions]

🔍 Build Scan® (commit: c202228)

Job name	Status	Build Scan®
build-ubicloud-standard-8-jdk-8	✅	https://ge.armeria.dev/s/qv5d2esrix7fy
build-ubicloud-standard-8-jdk-21-snapshot-blockhound	✅	https://ge.armeria.dev/s/6wtjkwjgnmnrc
build-ubicloud-standard-8-jdk-17-min-java-17-coverage	✅	https://ge.armeria.dev/s/544jup3opzigg
build-ubicloud-standard-8-jdk-17-min-java-11	✅	https://ge.armeria.dev/s/4j7hbjiim7irw
build-ubicloud-standard-8-jdk-17-leak	✅	https://ge.armeria.dev/s/czux3zh5tjsve
build-ubicloud-standard-8-jdk-11	✅	https://ge.armeria.dev/s/tl5b4q6bg2liu
build-macos-12-jdk-21	✅	https://ge.armeria.dev/s/k2xgn375bdchi

[minwoox]

👍 👍 👍

[jrhee17]

👍 👍