Add CI validation for the release drafter configuration

.gitignore

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+*.iml
+.idea/*

Jenkinsfile

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+node('node') {
+    stage('Release drafter configuration validation') {
+        sh './scripts/validateReleaseDrafterConfiguration.sh'
+    }
+}

scripts/validateReleaseDrafterConfiguration.sh

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+#!/usr/bin/env bash
+
+set -euo pipefail
+
+HERE="$( cd -P "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+RELEASE_DRAFTER_CONFIG="$HERE/../.github/release-drafter.yml"
+
+AJV_VERSION='3.2.0'
+
+pushd $TMPDIR || exit
+echo "Installing AJV"
+npm install -s -g "ajv-cli@${AJV_VERSION}"
+
+# TODO the schema should come from json schema once https://github.com/release-drafter/release-drafter/pull/600 is fixed
+echo "Downloading the release drafter validation schema"
+curl -Lso schema.json 'https://raw.githubusercontent.com/release-drafter/release-drafter/cec90728b088fe0fbc42bc15dd3d21bc59db34c6/schema.json'
+
+echo "Validating release drafter configuration"
+ajv validate -s schema.json -d "${RELEASE_DRAFTER_CONFIG}"
+
+popd || exit