[ CI ] Optimized ci

[souhailaS]

Brief Information

There is a an optimization opportunity for the ci.yml workflow, by taken advantage of shared cashing across the two jobs. There is no need to have a separate cache for each of the jobs.

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

The PR simplifies the workflow while preserving all it functionalities. Both jobs install the same dependencies, so they can share the same cache instead of having separate lint-and build-cache keys. Which increase cache hit rates.

Change impact

• Shared caching: Both jobs now use the same cache key, so the second job can reuse the first job's cached dependencies
• Cleaner configuration: Removed unnecessary environment variables
• Same functionality: All the same commands run in the same order with identical results

You can compare the CPU time taken by the workflow's old runs with the test runs in here: https://github.com/souhailaS/echarts/actions/runs/16315916920

Other information

We are a team of researchers from University of Zurich (https://www.ifi.uzh.ch/en/zest.html) currently working on automating energy optimizations in GitHub Actions workflows. This optimization maintains full functionality while reducing computational overhead and energy consumption.

[email protected]

[github-actions]

The changes brought by this PR can be previewed at: https://echarts.apache.org/examples/editor?version=PR-21110@6e8e514