Add update-script

Signed-off-by: Knut Ahlers <knut@ahlers.me>

.travis.yml

@@ -0,0 +1,7 @@
+sudo: required
+
+services:
+  - docker
+
+script:
+  - bash update.sh

update.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+set -euo pipefail
+
+### ---- ###
+
+echo "Switch back to master"
+git checkout master
+git reset --hard origin/master
+
+### ---- ###
+
+version=$(curl -s "https://lv.luzifer.io/catalog-api/openfire/latest.txt?p=version")
+versionVar=$(echo "${version}" | sed 's/\./_/g')
+grep -q "OPENFIRE_VERSION=${versionVar} " Dockerfile && exit 0 || echo "Update required"
+
+sed -Ei \
+	-e "s/OPENFIRE_VERSION=[0-9_]+/OPENFIRE_VERSION=${versionVar}/" \
+	Dockerfile
+
+### ---- ###
+
+echo "Testing image build and run..."
+
+function cleanup() {
+	docker rm -f luzifer-openfire
+}
+
+docker run -d --name luzifer-openfire $(docker build -q .)
+trap cleanup EXIT
+
+sleep 5 # Container needs a moment to spin up
+docker exec -ti luzifer-openfire sh -exc 'apk --no-cache add curl && curl -sL localhost:9090/index.jsp | grep -q "Openfire Setup"'
+
+### ---- ###
+
+echo "Updating repository..."
+git add Dockerfile
+git -c user.name='Travis Automated Update' -c user.email='travis@luzifer.io' \
+	commit -m "Openfire ${version}"
+git tag ${version}
+
+git push -q https://${GH_USER}:${GH_TOKEN}@github.com/luzifer-docker/openfire master --tags