Add circleCI.

Author: mwz

.circleci/config.yml

@@ -0,0 +1,41 @@
+version: 2
+jobs:
+  release:
+    docker:
+      - image: circleci/openjdk:8-jdk
+    steps:
+      - checkout
+      - add_ssh_keys:
+          fingerprints:
+            - "31:63:53:c4:af:b7:2c:a1:62:8e:b0:11:83:f8:62:eb"
+      - run:
+          name: Set up git
+          command: |
+            git config --global user.name "CircleCI"
+            git config --global user.email "[email protected]"
+            ssh-keyscan -T 15 github.com >> ~/.ssh/known_hosts
+      - setup_remote_docker
+      - run:
+          name: Release
+          command: |
+            sudo apt-get install -y jq
+            export VERSION=`jq -r '.version' vars.js`
+            docker login -u "$DOCKER_USER" -p "$DOCKER_PASS"
+            ./release.sh
+            git tag -a $VERSION -m "Release $VERSION."
+            git push --tags
+workflows:
+  version: 2
+  release:
+    jobs:
+      - hold:
+          type: approval
+          filters:
+            branches:
+              only: master
+      - release:
+          requires:
+            - hold
+          filters:
+            branches:
+              only: master

release.sh

@@ -1,8 +1,6 @@
 #!/usr/bin/env bash
 set -eu
 
-export VERSION=3.2.1
-
 # Build
 docker build -t mwizner/sonarqube-scala-plugins:$VERSION -t mwizner/sonarqube-scala-plugins:latest $VERSION
 docker build -t mwizner/sonarqube-scala-plugins:$VERSION-full $VERSION-full