Added circle ci integration

Added circle ci integration and automatic testing

.circleci/config.yml

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+workflows:
+  version: 2
+  build_test_deploy:
+    jobs:
+      - test
+      - publish_latest:
+          context: docker-hub
+          requires:
+            - test
+          filters:
+             branches:
+               only: 
+                 - master
+      - build_children:
+          context: circle-api
+          requires:
+            - publish_latest
+
+version: 2
+jobs:
+  test:
+    docker:
+      - image: circleci/python:2-jessie
+    steps:
+      - checkout
+
+      - setup_remote_docker:   # (2)
+          docker_layer_caching: true # (3)
+      - run:
+          name: Install goss
+          command: |
+            # rather than give internet scripts SU rights, we install to local user bin and add to path
+            mkdir ~/bin
+            export GOSS_DST=~/bin
+            export PATH=$PATH:~/bin
+            curl -fsSL https://goss.rocks/install | sh
+            goss -version
+      - run:
+          name: Test
+          command: |
+            # Don't forget path!
+            export PATH=$PATH:~/bin
+            # Important, change from mount to work on remote docker, see https://github.com/aelsabbahy/goss/pull/271
+            # If using machine image you do not need this.
+            export GOSS_FILES_STRATEGY=cp
+            ./run-tests.sh circleci keepimage
+      - run:
+          name: Save docker image
+          command: |
+            mkdir -p workspace
+            docker save -o workspace/steamcache-monolithic.tar steamcache/monolithic:goss-test
+      - persist_to_workspace:
+          root: workspace
+          paths:
+            steamcache-monolithic.tar
+      - store_test_results:
+          path: reports
+      - store_artifacts:
+          path: reports
+          destination: reports
+  publish_latest:
+    docker:
+      - image: circleci/python:2-jessie
+    steps:
+      - setup_remote_docker:   # (2)
+          docker_layer_caching: true # (3)
+      - attach_workspace:
+          at: /tmp/workspace
+      - run:
+          name: "Deploy latest to docker hub"
+          command: |
+            docker login -u $DOCKER_USER -p $DOCKER_PASS
+            docker load -i /tmp/workspace/steamcache-monolithic.tar
+            docker tag steamcache/monolithic:goss-test steamcache/monolithic:latest
+            docker push steamcache/monolithic:latest

goss.yaml

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+file:
+  /data/logs/access.log:
+    exists: true
+    contains: []
+  /data/logs/error.log:
+    exists: true
+    contains: []
+port:
+  tcp:80:
+    listening: true
+command:
+  /scripts/cache_test.sh:
+    exit-status: 0
+    stdout:
+    - Succesfully Cached
+    timeout: 10000
+process:
+  nginx:
+    running: true
+  supervisord:
+    running: true
+http:
+  http://127.0.0.1/steamcache-heartbeat:
+    status: 204
+    allow-insecure: false
+    no-follow-redirects: false
+    timeout: 0
+    body: []

goss_wait.yaml

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+process:
+  supervisord:
+    running: true
+  nginx:
+    running: true
+port:
+  tcp:80:
+    listening: true

run-tests.sh

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+#!/bin/bash
+which goss
+
+if [ $? -ne 0 ]; then
+	echo "Please install goss from https://goss.rocks/install"
+	echo "For a quick auto install run the following"
+	echo "curl -fsSL https://goss.rocks/install | sh"
+	exit $?
+fi
+
+docker build --tag steamcache/monolithic:goss-test .
+case $1 in
+  circleci)
+    shift;
+    mkdir -p ./reports/goss
+	if [[ "$1" == "keepimage" ]]; then
+		KEEPIMAGE=true
+		shift
+	fi
+    export GOSS_OPTS="$GOSS_OPTS --format junit"
+	dgoss run $@ steamcache/monolithic:goss-test > reports/goss/report.xml
+	#store result for exit code
+	RESULT=$?
+	#delete the junk that goss currently outputs :(
+    sed -i '0,/^</d' reports/goss/report.xml
+	#remove invalid system-err outputs from junit output so circleci can read it
+	sed -i '/<system-err>.*<\/system-err>/d' reports/goss/report.xml
+    ;;
+  *)
+	if [[ "$1" == "keepimage" ]]; then
+		KEEPIMAGE=true
+		shift
+	fi
+	dgoss run $@ steamcache/monolithic:goss-test
+	RESULT=$?
+    ;;
+esac
+[[ "$KEEPIMAGE" == "true" ]] || docker rmi steamcache/monolithic:goss-test
+
+exit $RESULT