ci: release workflow — deploy to Maven Central on tag push

[sunilp]

Summary

Adds .github/workflows/release.yml that fires on tag push (v*) and runs mvn -P release deploy to publish to Maven Central. Repository secrets (GPG_PRIVATE_KEY, GPG_PASSPHRASE, MAVEN_CENTRAL_USERNAME, MAVEN_CENTRAL_PASSWORD) are already configured.

Why

v0.2.0 is already tagged on main but the artifacts aren't on Maven Central — there was no release workflow. This PR adds the missing automation. After merge, re-pushing the tag (or pushing the next tag) will trigger the release.

Test plan

• CI green on existing mvn verify -B workflow
• After merge, delete + repush v0.2.0 tag to trigger the release workflow
• Confirm artifacts appear on https://central.sonatype.com under dev.jamjet:jamjet-cloud-sdk:0.2.0 and dev.jamjet:jamjet-cloud-spring-boot-starter:0.2.0

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6bb3c636-ec30-4b7e-9756-8a64d6491aad

📥 Commits

Reviewing files that changed from the base of the PR and between ea0b82d and e8eed00.

📒 Files selected for processing (1)

• .github/workflows/release.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/maven-central-release-workflow

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