Document devcontainer status: Repository does not use devcontainers

[Copilot]

Investigation confirms the Keycloak repository does not use devcontainers for development environments.

Findings:

• No .devcontainer directory or devcontainer.json configuration exists
• Development requires local JDK 17/21, Git, and Maven setup per docs/building.md
• Docker usage limited to container distribution and test infrastructure, not dev environments
• Git history shows no devcontainer-related commits

Development Setup:

# Current approach - local tooling
git clone https://github.com/keycloak/keycloak.git
cd keycloak
./mvnw clean install
java -jar quarkus/server/target/lib/quarkus-run.jar start-dev

No changes made to repository—this PR documents investigation results only.

Original prompt

does this repo use devcontainers

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