Enable Gradle cache in build.yml and windows-build.yml workflows using gradle/actions/setup-gradle

[Copilot]

This PR enables Gradle caching in both build.yml and windows-build.yml GitHub Actions workflows to improve build performance for Java components built with Gradle.

Problem

Previously, Gradle dependencies and build cache were not being cached between workflow runs in either workflow, causing slower build times and unnecessary network usage. The build.yml workflow was particularly affected because its make command implicitly calls ./gradlew shadowJar in the libcobj directory, but without any caching optimization.

Solution

Added the gradle/actions/setup-gradle@v3 step to both workflows:

• windows-build.yml: Caches dependencies for the explicit ./gradlew shadowJar command
• build.yml: Caches dependencies for the implicit ./gradlew shadowJar called by the make command

Both actions are configured with gradle-version: wrapper to respect the project's Gradle wrapper configuration (currently Gradle 8.2.1).

Benefits

• Faster builds: Gradle dependencies, wrapper, and build cache are automatically cached between runs
• Reduced network usage: Dependencies are only downloaded when they change
• Better reliability: Consistent Gradle wrapper usage across both workflows
• No breaking changes: Existing build logic remains unchanged, only caching is added
• Future-proof: Uses the recommended gradle/actions/setup-gradle action instead of the deprecated gradle/gradle-build-action

Technical Details

The gradle/actions/setup-gradle action automatically handles caching of:

• Gradle wrapper distribution
• Gradle dependency cache
• Gradle build cache
• Configuration cache (when enabled)

The build.yml workflow benefits from this caching because when it runs make, the libcobj/Makefile.am executes ./gradlew shadowJar to build the Java library components.

Fixes #396.

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[yutaro-sakamoto]

@copilot
このリポジトリではlibcobj/ディレクトリがgradleプロジェクトなのでそれを踏まえて修正できる?

[Copilot]

@copilot
このリポジトリではlibcobj/ディレクトリがgradleプロジェクトなのでそれを踏まえて修正できる?

You're absolutely right! I missed the create-release.yml workflow which also uses Gradle for publishing packages. I've now updated it to include the gradle/gradle-build-action@v3 with proper caching configuration as well. The change ensures all workflows that use the libcobj/ Gradle project now benefit from Gradle caching. See commit 77527af.

[yutaro-sakamoto]

@copilot
Use gradle/actions/setup-gradle instead.
I think gradle/gradle-build-action is deprecated

[Copilot]

@copilot
Use gradle/actions/setup-gradle instead.
I think gradle/gradle-build-action is deprecated

You're absolutely right! I've updated all five workflows to use gradle/actions/setup-gradle@v3 instead of the deprecated gradle/gradle-build-action@v3. The change maintains the same caching functionality while using the recommended action. See commit adbbf7d.

[Copilot]

Pull Request Overview

This PR enables Gradle caching in GitHub Actions workflows to improve build performance by adding the gradle/actions/setup-gradle@v3 action to five workflows that use Gradle. This will cache Gradle dependencies, wrapper, and build cache between workflow runs.

• Added Gradle setup step with caching to five GitHub Actions workflows
• Replaced deprecated gradle/gradle-build-action with the recommended approach
• Configured to use project's Gradle wrapper version for consistency

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
.github/workflows/windows-build.yml	Added Gradle setup for shadowJar build caching
.github/workflows/update-github-pages.yml	Added Gradle setup for Javadoc generation caching
.github/workflows/static-analysis.yml	Added Gradle setup for SpotBugs and PMD task caching
.github/workflows/javadoc.yml	Added Gradle setup for Javadoc generation caching
.github/workflows/create-release.yml	Replaced deprecated gradle-build-action with setup-gradle and direct command execution

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[yutaro-sakamoto]

@copilot

gradleのキャッシュによる高速化は.github/workflows/build.ymlと.github/workflows/windows-build.yml に対してのみ適用するように変更して

[Copilot]

@copilot

gradleのキャッシュによる高速化は.github/workflows/build.ymlと.github/workflows/windows-build.yml に対してのみ適用するように変更して

I've updated the workflows to limit Gradle caching to only windows-build.yml as requested. The gradle/actions/setup-gradle has been removed from static-analysis.yml, javadoc.yml, update-github-pages.yml, and create-release.yml.

Note: build.yml was not modified since it doesn't currently use any Gradle commands. Only windows-build.yml now has Gradle caching enabled. See commit 8647778.

[yutaro-sakamoto]

@copilot
build.ymlはmakeコマンド実行時に暗黙にgradleを使っています。
build.ymlに対してもキャッシュによる高速化を施して

[Copilot]

@copilot
build.ymlはmakeコマンド実行時に暗黙にgradleを使っています。
build.ymlに対してもキャッシュによる高速化を施して

You're absolutely right! I've added Gradle caching to build.yml since the make command implicitly calls ./gradlew shadowJar in the libcobj directory. Both build.yml and windows-build.yml now have Gradle cache optimization enabled. See commit 7e99233.