Add Copilot instructions for repository

[Copilot]

Configures repository-specific instructions for GitHub Copilot coding agent as documented in the best practices guide.

Changes

Added .github/copilot-instructions.md covering:

• Technology stack: Kotlin 2.1.10, Java 21, Maven, Kubernetes/Docker operators
• Build/test commands: Maven lifecycle with Docker integration requirements
• Code conventions: Formatting rules from .editorconfig, Kotlin patterns, Apache License header requirements
• Architecture: Operator interfaces, platform-specific implementations (Kubernetes/Docker), event system, core models
• Testing patterns: JUnit 5 setup, coroutine-based integration tests, helper utilities
• Key dependencies: Fabric8 Kubernetes client, custom Docker client, Kotlin coroutines
• CI/CD: GitHub Actions workflow testing against multiple Kubernetes versions

This provides Copilot with context to generate code consistent with project conventions.

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:

• nexus.openanalytics.eu
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --enable-native-access=ALL-UNNAMED -classpath /usr/share/apache-maven-3.9.11/boot/plexus-classworlds-2.9.0.jar -Dclassworlds.conf=/usr/share/apache-maven-3.9.11/bin/m2.conf -Dmaven.home=/usr/share/apache-maven-3.9.11 -Dlibrary.jansi.path=/usr/share/apache-maven-3.9.11/lib/jansi-native -Dmaven.multiModuleProjectDirectory=/home/REDACTED/work/shinyproxy-operator/shinyproxy-operator org.codehaus.plexus.classworlds.launcher.Launcher -U clean install -DskipTests (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)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>✨ Set up Copilot instructions</issue_title>
<issue_description>Configure instructions for this repository as documented in Best practices for Copilot coding agent in your repository.

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes ✨ Set up Copilot instructions #5

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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.