Add comprehensive GitHub Copilot instructions for consumer-driven-contract-testing repository

[Copilot]

This PR adds a comprehensive .github/copilot-instructions.md file that provides GitHub Copilot coding agents with detailed guidance on how to work effectively in this Consumer Driven Contract Testing workshop repository.

Key Features

Validated Commands: All build, test, and run commands have been tested and timed to ensure they work correctly:

• Clean compile: ./mvnw clean compile (~30s first run, ~3s subsequent)
• Package with working tests: ./mvnw package -Dtest='!CustomerServiceTest#testGetCustomerByIdWithWireMockCloud' (~6-8s)
• Service startup: ./mvnw -pl {service} spring-boot:run (~1.5s each)

Critical Timeout Guidance: Includes explicit "NEVER CANCEL" warnings with specific timeout recommendations (60+ minutes for builds, 30+ minutes for tests) to prevent premature cancellation of operations.

Known Issues Documentation: Documents the external network dependency failure in CustomerServiceTest#testGetCustomerByIdWithWireMockCloud with a working workaround using test exclusion.

Manual Validation Scenarios: Provides step-by-step instructions for testing service integration and contract testing functionality after making changes.

Repository Context

This workshop repository demonstrates Consumer Driven Contract Testing with:

• customer-service (provider): Spring Boot service on port 9090
• invoice-service (consumer): Spring Boot service on port 8080
• Technology stack: Spring Boot 3.2.5, Spring Cloud Contract 4.1.2, Java 17, Maven 3.9.6

The instructions help agents understand this is a tutorial repository with intentionally incomplete contract configurations that are completed through the README exercises.

Fixes #5.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• qgdoz.wiremockapi.cloud
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java -jar /home/REDACTED/work/consumer-driven-contract-testing/consumer-driven-contract-testing/invoice-service/target/surefire/surefirebooter-20250903112850603_3.jar /home/REDACTED/work/consumer-driven-contract-testing/consumer-driven-contract-testing/invoice-service/target/surefire 2025-09-03T11-28-50_544-jvmRun1 surefire-20250903112850603_1tmp surefire_0-20250903112850603_2tmp (dns block)
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java -jar /home/REDACTED/work/consumer-driven-contract-testing/consumer-driven-contract-testing/invoice-service/target/surefire/surefirebooter-20250903113025302_6.jar /home/REDACTED/work/consumer-driven-contract-testing/consumer-driven-contract-testing/invoice-service/target/surefire 2025-09-03T11-30-24_665-jvmRun1 surefire-20250903113025302_4tmp surefire_1-20250903113025302_5tmp (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.