Ensure to upload path instead of key which sometimes doesn't match

[jonesbusy]

Fixes #24

Sometimes the filename and the key of the artifact are different.

Ensure to publish the file path instead of the key

[withMaven] artifactsPublisher - Archive artifact pom.xml under test/simple-maven-project-with-tests/1.0-SNAPSHOT/simple-maven-project-with-tests-1.0-SNAPSHOT.pom
[withMaven] artifactsPublisher - Archive artifact target/simple-maven-project-with-tests-1.0-SNAPSHOT.jar under test/simple-maven-project-with-tests/1.0-SNAPSHOT/simple-maven-project-with-tests-1.0-SNAPSHOT.jar

Testing done

pipeline {
    agent any
    stages {
        stage('Build') {
            steps {
                git url: 'https://github.com/jglick/simple-maven-project-with-tests.git'
                withMaven {
                    sh "mvn -Dmaven.test.failure.ignore=true clean package"
                }
            }
        }
    }
}

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