Configure Gradle publishing to GitHub Packages

[Copilot]

Adds GitHub Packages as a Maven publishing target for distributing imcjava artifacts.

Changes

build.gradle

• Configured GitHub Packages Maven repository with credential support via environment variables (GITHUB_ACTOR, GITHUB_TOKEN) or gradle properties (gpr.user, gpr.key)
• Added explicit Maven publication metadata (groupId, artifactId, version)
• Retained existing local file system publishing for backward compatibility

README.md

• Documented publishing workflow for GitHub Packages
• Added consumer configuration example showing repository and credential setup

Publishing

export GITHUB_ACTOR=username
export GITHUB_TOKEN=token
./gradlew publish

Consuming

repositories {
    maven {
        url = uri("https://maven.pkg.github.com/oceanscan/imcjava")
        credentials {
            username = project.findProperty("gpr.user") ?: System.getenv("GITHUB_ACTOR")
            password = project.findProperty("gpr.key") ?: System.getenv("GITHUB_TOKEN")
        }
    }
}

dependencies {
    implementation 'pt.lsts:imcjava:5.5.5-unify'
}

Original prompt

Setup maven publishing using github repository.

---

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