Unify CI configure workflow

[RAMitchell]

Summary

• Add a reusable ci_configure.yml workflow for ECR login and CI image tag resolution.
• Replace the duplicated ci-configure jobs in main.yml, jvm_tests.yml, and misc.yml with calls to the reusable workflow.
• Preserve the existing job id and output names so downstream needs.ci-configure.outputs.* references do not change.

Rationale

The configure job still needs to run before containerized jobs because GitHub Actions resolves container.image and container.credentials before job steps execute. This change keeps that staging model, but removes the copied implementation from each workflow.

python_wheels_variants.yml still has a separate ECR login job because it uses a different ecr-login pattern and image tag flow.

Testing

• git diff --check
• pre-commit run --files .github/workflows/ci_configure.yml .github/workflows/main.yml .github/workflows/jvm_tests.yml .github/workflows/misc.yml
• Parsed modified workflow YAML with PyYAML
• Checked that all callers still reference the reusable workflow outputs via needs.ci-configure.outputs.*

[Copilot]

Pull request overview

This PR centralizes the repeated “ci-configure” logic (ECR login + CI image tag selection) into a reusable GitHub Actions workflow and updates existing CI workflows to call it, keeping downstream needs.ci-configure.outputs.* references stable.

Changes:

• Added reusable workflow .github/workflows/ci_configure.yml exposing the same outputs as the prior duplicated jobs.
• Updated main.yml, jvm_tests.yml, and misc.yml to replace inline ci-configure job steps with a uses: call to the reusable workflow.
• Parameterized the runner tag via tag-prefix to preserve per-workflow runner tagging.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
.github/workflows/ci_configure.yml	Introduces reusable workflow_call implementation for ECR login + image tag resolution and exposes outputs.
.github/workflows/main.yml	Replaces duplicated ci-configure job with a call to the reusable workflow (tag-prefix main).
.github/workflows/jvm_tests.yml	Replaces duplicated ci-configure job with a call to the reusable workflow (tag-prefix jvm-tests).
.github/workflows/misc.yml	Replaces duplicated ci-configure job with a call to the reusable workflow (tag-prefix misc).

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