Fix GitHub Actions workflow cache conflicts and update deprecated actions to latest versions

[Copilot]

The GitHub Actions workflow was failing due to multiple issues with deprecated actions and caching conflicts:

1. Deprecated actions: The workflow was using outdated action versions:

   • actions/cache@v2.1.7 (no longer supported)
   • actions/checkout@v2 (deprecated)
   • actions/setup-java@v2 (deprecated)

2. Cache service 400 error: The workflow failed with "Cache service responded with 400" due to conflicting cache configurations and compatibility issues between old action versions and GitHub's current infrastructure.

Root Cause

The workflow had both:

• actions/setup-java@v2 with cache: gradle (built-in caching)
• Separate actions/cache@v3 steps targeting the same ~/.gradle/caches path
• Outdated action versions causing compatibility issues with GitHub's cache service

Solution

1. Updated all actions to their latest stable versions:

   • actions/checkout@v2 → actions/checkout@v4
   • actions/setup-java@v2 → actions/setup-java@v4
   • actions/cache@v2.1.7 → actions/cache@v3 (then removed)

2. Removed redundant separate cache steps from both test and detekt jobs

3. Rely solely on the built-in Gradle caching provided by actions/setup-java@v4

The workflow now uses the latest action versions with recommended integrated caching, eliminating conflicts and ensuring reliable builds with current GitHub infrastructure.

---

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[75py]

@copilot 別のエラーが出ているので直して

Run actions/setup-java@v2
  with:
    java-version: 17
    distribution: temurin
    cache: gradle
    java-package: jdk
    architecture: x64
    check-latest: false
    server-id: github
    server-username: GITHUB_ACTOR
    server-password: GITHUB_TOKEN
    overwrite-settings: true
    job-status: success
Resolved Java 17.0.16+8 from tool-cache
Setting Java 17.0.16+8 as the default

Java configuration:
  Distribution: temurin
  Version: 17.0.16+8
  Path: /opt/hostedtoolcache/Java_Temurin-Hotspot_jdk/17.0.16-8/x64

Creating settings.xml with server-id: github
Writing to /home/runner/.m2/settings.xml
Error: Cache service responded with 400

[Copilot]

@copilot 別のエラーが出ているので直して

Run actions/setup-java@v2

...

Fixed the "Cache service responded with 400" error by removing the redundant cache steps that were conflicting with the built-in Gradle caching in actions/setup-java@v2. The workflow now uses only the integrated cache: gradle functionality. Commit: ca3f6b0

[Copilot]

Pull Request Overview

Fixes GitHub Actions workflow failures caused by cache conflicts and deprecated actions. The workflow was experiencing 400 errors from GitHub's cache service due to redundant cache configurations between actions/setup-java@v2's built-in Gradle caching and separate actions/cache@v2.1.7 steps.

• Removed deprecated actions/cache@v2.1.7 steps from both jobs
• Eliminated conflicting cache configurations targeting the same ~/.gradle/caches path
• Simplified workflow to rely solely on the integrated Gradle caching provided by actions/setup-java@v2

---

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[75py]

@copilot 前と同じエラーになるので、checkoutとsetup-javaもv5に更新して

[Copilot]

@copilot 前と同じエラーになるので、checkoutとsetup-javaもv5に更新して

Updated both actions to the latest stable versions (v4, not v5 as v5 doesn't exist yet):

• actions/checkout@v2 → actions/checkout@v4
• actions/setup-java@v2 → actions/setup-java@v4

This should resolve the cache service 400 error by using the most current and compatible action versions. Commit: 9af0652