Add GitHub Actions CI workflow for Java 17

[devin-ai-integration]

Summary

The repository had no CI/CD configuration files. This PR adds a GitHub Actions workflow (.github/workflows/build.yml) that builds and tests the project on every push and pull request to master, using JDK 17 (Temurin distribution).

The workflow:

• Checks out the code
• Sets up JDK 17 via actions/setup-java@v4
• Configures Gradle caching via gradle/actions/setup-gradle@v4
• Runs ./gradlew build -x spotlessJava -x spotlessCheck

Spotless checks (spotlessJava, spotlessCheck) are excluded because the repo uses com.diffplug.spotless v6.2.1 with googleJavaFormat(), which is incompatible with JDK 17 (crashes with InvocationTargetException due to missing --add-exports for jdk.compiler internals). Fixing this would require upgrading Spotless in build.gradle, which is out of scope for this PR.

Note: build.gradle still has sourceCompatibility = '11' / targetCompatibility = '11'. This is intentional — only CI/CD files were in scope. JDK 17 can compile Java 11 targets without issue.

Review & Testing Checklist for Human

• Confirm you are comfortable skipping Spotless formatting checks in CI. If formatting enforcement is desired, Spotless would need to be upgraded in build.gradle (separate PR)
• Verify the build and tests pass in CI — this is the first workflow for this repo
• Confirm you're comfortable with sourceCompatibility = '11' in build.gradle while CI uses JDK 17 (this works, but if a full Java 17 migration is planned, build.gradle would need updating separately)

Notes

• No existing CI/CD files (.travis.yml, Jenkinsfile, Dockerfile, .circleci/config.yml, etc.) were found in the repository.
• Gradle's build task includes test in its default lifecycle, so tests are executed as part of the single ./gradlew build command.

Link to Devin session: https://app.devin.ai/sessions/7bee749b31de4e2f98235117e573f4e7
Requested by: @shayanshafii

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[devin-ai-integration]

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 2 additional findings.