fileserver: migrate pingcap/tidb artifact downloads to OCI registry

[Copilot]

Removes all fileserver.pingcap.net references from pingcap/tidb pipelines and jobs, replacing binary artifact fetching with OCI pulls via hub-zot.pingcap.net/mirrors/hub.

Core pattern change

Before:

environment { FILE_SERVER_URL = 'http://fileserver.pingcap.net' }
// ...
component.fetchAndExtractArtifact(FILE_SERVER_URL, 'tikv', REFS.base_ref, ...)
component.fetchAndExtractArtifact(FILE_SERVER_URL, 'pd',   REFS.base_ref, ...)

After:

environment { OCI_ARTIFACT_HOST = 'hub-zot.pingcap.net/mirrors/hub' }
// ...
final OCI_TAG_PD   = component.computeArtifactOciTagFromPR('pd',   REFS.base_ref, ...)
final OCI_TAG_TIKV = component.computeArtifactOciTagFromPR('tikv', REFS.base_ref, ...)
// ...
container("utils") {
    dir("bin") {
        retry(3) {
            sh label: 'download tidb components', script: """
                ${WORKSPACE}/scripts/artifacts/download_pingcap_oci_artifact.sh \
                    --pd=${OCI_TAG_PD} --tikv=${OCI_TAG_TIKV}
            """
        }
    }
}

Changes by category

• ~60 integration/check2 test pipelines (release-6.x → release-9.0-beta, latest): replaced fetchAndExtractArtifact for tikv/pd with OCI download; added OCI_TAG_* declarations; added utils sidecar container to pod templates where missing
• ~13 build pipelines (pull_build, ghpr_build): removed fileserver artifact upload steps and CI-flag curl uploads — builds no longer push to fileserver
• periodics_integration_test.groovy: rewrote to use OCI download, removed sha1-based fileserver tracking
• Tiflash integration tests: added OCI_TAG_TIFLASH; replaced tiflash binary and vector-search test data downloads (now pulled from ann-benchmarks.com)
• Sqllogic pod templates: init containers now use oras pull from OCI registry instead of wget from fileserver
• pull_br_integration_test_next_gen/download_tools.sh: localstack binary now fetched from GitHub Releases; removed deprecated tikv-importer download helper
• release-6.x/ghpr_unit_test.groovy: codecov binary now downloaded from uploader.codecov.io; fileserver-based junitUrl cleared
• prow-jobs/pingcap/tidb/latest-periodics.yaml: updated stale commented-out codecov URL

Original prompt

---

This section details on the original issue you should resolve

<issue_title>fileserver: migrate artifacts for pingcap/tidb</issue_title>
<issue_description>Replace fileserver.pingcap.net usage for pingcap/tidb with OCI artifacts in a standard registry.

Acceptance criteria:

• No fileserver.pingcap.net references in jobs/pipelines for pingcap/tidb
• Artifacts pulled via OCI registry with documented paths
  </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes fileserver: migrate artifacts for pingcap/tidb #4210

---

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[ti-chi-bot]

Hi @Copilot. Thanks for your PR.

I'm waiting for a PingCAP-QE member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[wuhuizuo]

@copilot you pr has conflicts

[Copilot]

@copilot you pr has conflicts

The conflicts have been resolved — a merge commit (92c0361) from main has been applied to the branch, bringing it up to date.

[wuhuizuo]

Split release-8.5 changes out to sub PR #4293 (tracked by #4292).

This PR branch has been updated to drop all pipelines/pingcap/tidb/release-8.5/** changes so they can be reviewed independently.