Adds support for promoting to maven central (#78)

* Adds support for promoting to maven central

scripts/Dockerfile

@@ -1,6 +1,8 @@
 ARG base_image=ubuntu:bionic
 FROM ${base_image}
 
+ADD https://repo.spring.io/libs-release/io/spring/concourse/releasescripts/concourse-release-scripts/0.3.2/concourse-release-scripts-0.3.2.jar /opt/concourse-release-scripts.jar
+
 RUN apt-get update && apt-get install --no-install-recommends -y \
-    git \
+    git gnupg \
  && rm -rf /var/lib/apt/lists/*

scripts/deploy.sh

@@ -4,6 +4,29 @@ set -euo pipefail
 
 [[ -d "${PWD}"/maven && ! -d "${HOME}"/.m2 ]] && ln -s "${PWD}"/maven "${HOME}"/.m2
 
+function clean_gpg {
+    FINGERPRINT=$(gpg --list-keys | head -4 | tail -1 | tr -d ' ')
+    gpg --batch --yes --delete-secret-keys "$FINGERPRINT"
+    gpg --batch --yes --delete-keys "$FINGERPRINT"
+}
+
+trap clean_gpg EXIT
+gpg --batch --import-options import-show --import <(echo "$MAVEN_GPG_PRIVATE_KEY")
+
+mkdir -p ~/.m2
+cat <<EOF > ~/.m2/settings.xml
+<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 https://maven.apache.org/xsd/settings-1.0.0.xsd">
+  <servers>
+    <server>
+      <id>gpg.passphrase</id>
+      <passphrase>${MAVEN_GPG_PASSPHRASE}</passphrase>
+    </server>
+  </servers>
+</settings>
+EOF
+
 REPOSITORY="${PWD}"/repository
 
 cd source

scripts/promote-to-maven-central.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+export BUILD_INFO_LOCATION=$(pwd)/repository/build-info.json
+
+java -jar /opt/concourse-release-scripts.jar publishToCentral 'RELEASE' "$BUILD_INFO_LOCATION" repository
+
+echo "Sync complete"