Add command to spawn a development environment

For development, now doing `npm run dev` will spawn containers with the
necessary dependencies for developing and testing the supervisor.

Dockerfile.template

@@ -101,6 +101,11 @@ COPY src ./src
 COPY test ./test
 COPY typings ./typings
 
+##################################################
+# CI tests are ran here
+##################################################
+FROM test as test-ci
+
 # Run tests
 RUN npm run test
 

docker-compose.dev.yml

@@ -0,0 +1,25 @@
+version: '2'
+
+services:
+  docker:
+    image: docker:dind
+    privileged: true
+    environment:
+      DOCKER_TLS_CERTDIR: ''
+    command: --tls=false --debug
+
+  sut:
+    build:
+      context: ./
+      dockerfile: Dockerfile.template
+      target: test
+      args:
+        # Change this if testing in another architecture
+        ARCH: amd64
+    command: sleep infinity
+    environment:
+      DOCKER_HOST: tcp://docker:2375
+    volumes:
+      - './.mochapodrc.yml:/usr/src/app/.mochapodrc.yml'
+      - './src:/usr/src/app/src'
+      - './test:/usr/src/app/test'

package.json

@@ -8,6 +8,8 @@
 		"url": "https://github.com/balena-os/balena-supervisor.git"
 	},
 	"scripts": {
+		"dev": "docker-compose -f docker-compose.dev.yml up --build || npm run compose:down",
+		"compose:down": "docker-compose -f docker-compose.dev.yml down",
 		"start": "./entry.sh",
 		"build": "npm run clean && npm run release && webpack",
 		"lint": "balena-lint -e ts -e js --typescript src/ test/ typings/ build-utils/ webpack.config.js",