docker: use nodejs 6.10.0

- Pull Node version from .nvmrc
- Migrate passwords out of .travis.yml

.travis.yml

@@ -10,11 +10,5 @@ services:
 script: make travis
 after_success:
   - nvm version
-  - if [[ ! -z "$DOCKER_USER" ]] && [[ "$(nvm version)" = "v0.12."* ]]; then docker login -u ${DOCKER_USER} -p ${DOCKER_PASS} && git checkout -- . && git clean -fd . && make docker_release; fi
+  - if [[ ! -z "$DOCKER_USER" ]]; then docker login -u ${DOCKER_USER} -p ${DOCKER_PASS} && git checkout -- . && git clean -fd . && make docker_release; fi
 after_script: make report
-env:
-  global:
-    - secure: "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"
-    - secure: "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"
-    - secure: "ZfFaKGU6OxyPFWuFT4eqIzpxJDZB9ABEe3L+mlyH6trhzFcA3EMghhAwuJOm4tvaRrn32l378b451qrcJ84TmKHB8KxYo7krAfIb5zf49A08YoCMpqKqITSS13jCiEuM0Yua8epXRbHzEiEuq8xGV1fqXZ3Wvii/IA0qVV2RTaM="
-    - secure: "AKz1AcG+xxnAPlMf7twqho6TsCwjafSHFObiUVP7J47t74HLklbKzI3hH7mJpkpYLhRDYGbQSzgP1Is00Hy4EwJyChocKMnWIsY2+5mGg1fkV5I2L1sncLtxyLakFw2TBQFvju7f7FaYtpvv9L3mt9i5JZ4E7BmSO+YBDv53uTA="

Dockerfile.example

@@ -1,4 +1,4 @@
-FROM node:0.12
+FROM node:6.10.0
 
 MAINTAINER Nightscout Contributors
 

Makefile

@@ -50,10 +50,14 @@ travis:
 docker_release:
 	# Get the version from the package.json file
 	$(eval DOCKER_TAG=$(shell cat package.json | jq '.version' | tr -d '"'))
+	$(eval NODE_VERSION=$(shell cat .nvmrc))
+	#
+	# Create a Dockerfile that contains the correct NodeJS version
+	cat Dockerfile.example | sed -e "s/^FROM node:.*/FROM node:${NODE_VERSION}/" > Dockerfile
 	#
 	# Rebuild the image. We do this with no-cache so that we have all security upgrades,
 	# since that's more important than fewer layers in the Docker image.
-	docker build --no-cache=true -f Dockerfile.example -t $(DOCKER_IMAGE):$(DOCKER_TAG) .
+	docker build --no-cache=true -t $(DOCKER_IMAGE):$(DOCKER_TAG) .
 	# Push an image to Docker Hub with the version from package.json:
 	docker push $(DOCKER_IMAGE):$(DOCKER_TAG)
 	#
@@ -68,5 +72,6 @@ docker_release:
 		docker tag $(DOCKER_IMAGE):$(DOCKER_TAG) $(DOCKER_IMAGE):latest_dev && \
 		docker push $(DOCKER_IMAGE):latest_dev; \
 	fi
+	rm -f Dockerfile
 
 .PHONY: all coverage docker_release report test travis