ci: Enable ccruntime-e2e and makefile test on arm64

[seungukshin]

This changes enables e2e and makefile test on arm64 runner. There are some prerequisite.

Ther operator's CI is as following: (${\color{red}red}$ parts are added by this change)

• ccruntime-nightly (executed at 02:00 everyday)
  • call ccruntime-e2e (e2e test on amd64, s390x, ${\color{red}arm64}$)
• ccruntime-pr (exectued at pull request)
  • call ccruntime-e2e (e2e test on amd64, s390x, ${\color{red}arm64}$)
• docker-publish-latest-on-merge (build images on amd64)
• docker-publish-on-tag (build images on amd64)
• enclave-cc-cicd (sgx specific test on amd64)
• enclave-cc-e2e (sgx specific test on amd64)
• gofmt (lint on amd64)
• golangci-lint (lint on amd64)
• makefile
  • build test on amd64, ${\color{red}arm64}$
  • lib-codeql (static analysis on amd64)
  • envtest on amd64, ${\color{red}arm64}$

[seungukshin]

e2e test on ubuntu-20.04 failed because of DiskPressure which required 15% of free space (14% on ubunut-20.04). So I added a commit to move GOPATH to /mnt fo free more space on / (now 16% on ubuntu-20.04). I confirmed e2e test passed on ubunut-20.04 after this change. (https://github.com/seungukshin/operator/actions/runs/12866737850/job/35871382480)

[seungukshin]

Now GitHub arm runner is available (https://github.blog/changelog/2025-01-16-linux-arm64-hosted-runners-now-available-for-free-in-public-repositories-public-preview/), so I tested ccruntime-e2e and makefile on them and fix some issue. The test results are following:

• ccruntime-e2e: https://github.com/seungukshin/operator/actions/runs/12866737850
• makefile: https://github.com/seungukshin/operator/actions/runs/12888159173

[seungukshin]

Some part of change is merged as a part of this PR, so resolved the merge conflict.

Test results on ubuntu-22.04, ubuntu-20.04 and ubuntu-22.04-arm: https://github.com/seungukshin/operator/actions/runs/12932473305