feat: Add sccache to speed up Docker image building

[tfhddd]

What this PR does / why we need it?

The current Docker build time is too long. By adding sccache, the compilation speed of mooncake and vllm-ascend can be improved.

Does this PR introduce any user-facing change?

1. Install sccache;
2. Connect to GitHub's GHA for sccache caching;
3. Enable sccache caching in mooncake;
4. Add sccache compatibility to vllm-ascend.

Why use GitHub's GHA for caching:
Docker image builds use GitHub servers, and using GitHub's GHA can avoid network latency.

How was this patch tested?

Currently, the overall build time is 2 hours and 38 minutes.

After optimization, the overall build time is 1 hour and 14 minutes.

• vLLM version: v0.18.0
• vLLM main: vllm-project/vllm@ed359c4

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the Docker image building process by introducing sccache, a compiler caching tool. The changes modify several Dockerfiles and associated build configurations to enable and utilize sccache, aiming to reduce build times and improve overall efficiency, especially within a GitHub Actions environment.

Highlights

• Integration of sccache: sccache is integrated into various Dockerfiles (Dockerfile, Dockerfile.310p, Dockerfile.310p.openEuler, Dockerfile.a3, Dockerfile.a3.openEuler) to leverage its caching capabilities for faster Docker image builds.
• Build process enhancements: The build scripts and CMake configurations are updated to prioritize sccache over ccache when available, ensuring that the build process benefits from the new caching mechanism.
• Environment variable configuration: New ARG variables (SCCACHE_GHA_ENABLED, MATRIX_ARCH) and ENV variables (ACTIONS_RESULTS_URL, ACTIONS_RUNTIME_TOKEN, ACTIONS_CACHE_SERVICE_V2, SCCACHE_GHA_ENABLED) are introduced in the Dockerfiles to support GitHub Actions caching for sccache.

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Ignored Files

• Ignored by pattern: .github/workflows/** (2)
  • .github/workflows/_schedule_image_build.yaml
  • .github/workflows/schedule_image_build_and_push.yaml

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[gemini-code-assist]

Code Review

This pull request integrates sccache into the Docker image build process across various Dockerfiles to enhance build caching and reduce build times. It introduces new build arguments and modifies build scripts to utilize sccache. The review highlights a critical issue where the specified sccache version v0.14.0 is incorrect and will cause build failures, suggesting v0.8.0 as a valid alternative. Additionally, the sccache installation logic is duplicated across multiple Dockerfiles, which should be refactored into a shared script for better maintainability.