Docker images (#527)

with this change we're adding generation of 2 docker images - verifier and stub runner
we also added a project `spring-cloud-contract-stub-runner-boot` which contains a far jar with stub runner boot

fixes gh-526, gh-516

docker/spring-cloud-contract-docker/get_dependencies.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+set -e
+
+WRAPPER_VERSION="4.4.1"
+GRADLE_BIN_DIR="gradle-${WRAPPER_VERSION}-bin"
+GRADLE_WRAPPER_DIR="${HOME}/.gradle/wrapper/dists/${GRADLE_BIN_DIR}"
+CURRENT_DIR="$( pwd )"
+GRADLE_OUTPUT_DIR="${CURRENT_DIR}/target/gradle_dependencies/"
+pushd project
+rm -rf .gradle
+./gradlew wrapper --gradle-version "${WRAPPER_VERSION}"
+./gradlew clean build -g "${GRADLE_OUTPUT_DIR}" -x copyOutput || echo "Expected to fail the build"
+if [ -d "${GRADLE_WRAPPER_DIR}" ]; then
+    echo "Copying Gradle Wrapper version [${WRAPPER_VERSION}]"
+    mkdir -p "${GRADLE_OUTPUT_DIR}/wrapper/dists/"
+    cp -r "${GRADLE_WRAPPER_DIR}" "${GRADLE_OUTPUT_DIR}/wrapper/dists/"
+else
+    echo "Gradle Wrapper [${GRADLE_WRAPPER_DIR}] not found. Will not copy it"
+fi
+rm -rf build
+popd