feat: official Dockerfile (#1619)

Adds a Dockerfile for building with Docker Hub

docker/Dockerfile

@@ -0,0 +1,16 @@
+FROM node:8.10.0-alpine
+
+LABEL maintainer="Rhys Arkins <rhys@arkins.net>"
+LABEL name="renovate"
+
+WORKDIR /src
+
+COPY package.json .
+COPY yarn.lock .
+RUN yarn install --production && yarn cache clean
+COPY lib ./lib
+RUN chown -R node:node /src
+USER node
+
+ENTRYPOINT ["node", "/src/lib/renovate.js"]
+CMD ["--help"]

docker/hooks/post_push

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+set -e
+
+SEMVER_REGEX="^v(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)$"
+
+if ! [[ "$CACHE_TAG" =~ $SEMVER_REGEX ]]; then
+  echo Not a semver tag - skipping
+  exit
+fi
+
+major=${BASH_REMATCH[1]}
+minor=${BASH_REMATCH[2]}
+
+# Tag and push image for each additional tag
+for tag in {"$major","${major}.${minor}"}; do
+  echo "Tagging ${DOCKER_REPO}:${tag}"
+  docker tag $IMAGE_NAME ${DOCKER_REPO}:${tag}
+  docker push ${DOCKER_REPO}:${tag}
+done

docker/hooks/readme.md

@@ -0,0 +1,5 @@
+# Docker Hub hooks
+
+This directory is required in order to provide a post-push hook to Docker Hub Autobuild.
+
+See https://docs.docker.com/docker-cloud/builds/advanced/#custom-build-phase-hooks for details.