chore: migrate build to Java 17

[raeperd]

Summary

• pin Java 17 with SDKMAN
• update Gradle wrapper to 7.6.4 so the build runs on Java 17
• update CI to use Temurin JDK 17
• set Gradle source compatibility to 17

Test

• ./gradlew clean build

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[chatgpt-codex-connector]

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Reviewed commit: 5d974ba638

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[chatgpt-codex-connector]

Use Java 17 runtime image for Jib build

Raising sourceCompatibility to 17 means compiled classes require Java 17 bytecode support, but the Jib base image is still openjdk:11.0.10-jre-buster (build.gradle), so images built via ./gradlew jib will fail at startup with UnsupportedClassVersionError. This migration should update the runtime image to a Java 17 JRE/JDK to keep container builds runnable.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: be7c9ff6-84f5-4b05-9a6b-3e8de4d38c30

📥 Commits

Reviewing files that changed from the base of the PR and between 6e303ff and 5d974ba.

📒 Files selected for processing (5)

• .github/workflows/build.yml
• .sdkmanrc
• build.gradle
• gradle/wrapper/gradle-wrapper.properties
• lombok.config

✨ Finishing Touches

🧪 Generate unit tests (beta)

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• Commit unit tests in branch chore/java-17-migration

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