chore(build): automatically build and publish the Docker image with Travis CI

Fixes #114.

.dockerignore

@@ -1,2 +1,3 @@
+coverage
 node_modules
-test-snapshot/output-actual
+tmp

.github/CONTRIBUTING.md

@@ -16,7 +16,7 @@ npm test
 Note: due to the nature of `thumbsup`, some tests require a working runtime environment including `exiftool`, `graphicsmagick` and `ffmpeg`. You can run the entire test suite inside Docker using:
 
 ```bash
-docker build .
+docker build -f Dockerfile.test .
 ```
 
 ## Manual tests

.travis.yml

@@ -1,17 +1,42 @@
-# Run the whole build inside Docker
+# Build steps need access to the Docker agent
 sudo: required
 services:
   - docker
 
 jobs:
   include:
-    - stage: build
-      script: docker build .
-    - stage: npm release
-      script: echo "Deploying to npm ..."
+
+    # Run all the tests inside Docker
+
+    - stage: Test
+      script: docker build -f Dockerfile.test .
+
+
+    # If this is a tagged commit, publish the package to npm
+
+    - stage: Release npm
+      script: echo "Deploying to npm"
       deploy:
         provider: npm
         email: asyncadventures@gmail.com
         api_key: $NPM_TOKEN
         on:
           tags: true
+          condition: $TRAVIS_TAG =~ ^\d+\.\d+\.\d+$
+
+    # If this is a tagged commit, publish a new Docker image
+
+    - stage: Release Docker
+      script: echo "Deploying to DockerHub"
+      deploy:
+        provider: script
+        script:
+          - DOCKER_IMAGE="thumbsupgallery/thumbsup"
+          - docker login -u "${DOCKER_USERNAME}" -p "${DOCKER_PASSWORD}"
+          - docker build -f Dockerfile.release -t "${DOCKER_IMAGE}:TRAVIS_TAG" --build-arg "PACKAGE_VERSION=${TRAVIS_TAG}" .
+          - docker tag "${DOCKER_IMAGE}:${TRAVIS_TAG}" "${DOCKER_IMAGE}:latest"
+          - docker push "${DOCKER_IMAGE}:${TRAVIS_TAG}"
+          - docker push "${DOCKER_IMAGE}:latest"
+        on:
+          tags: true
+          condition: $TRAVIS_TAG =~ ^\d+\.\d+\.\d+$

Dockerfile.release

@@ -0,0 +1,33 @@
+# ------------------------------------------------
+# Builder image
+# ------------------------------------------------
+
+FROM thumbsupgallery/build:alpine as build
+
+# Install thumbsup locally
+WORKDIR /thumbsup
+ARG PACKAGE_VERSION
+RUN if [ -z "${PACKAGE_VERSION}" ]; then \
+      echo "Please specify --build-arg PACKAGE_VERSION=<2.4.1>"; \
+      exit 1; \
+    fi;
+RUN echo "Installing thumbsup@${PACKAGE_VERSION}"
+RUN npm install thumbsup@${PACKAGE_VERSION}
+
+# ------------------------------------------------
+# Runtime image
+# ------------------------------------------------
+
+FROM thumbsupgallery/runtime:alpine
+
+# Use tini as an init process
+# to ensure all child processes (ffmpeg...) are always terminated properly
+RUN apk add --update tini
+ENTRYPOINT ["tini", "-g", "--"]
+
+# Copy the thumbsup files to the new image
+COPY --from=build /thumbsup /thumbsup
+RUN ln -s /thumbsup/node_modules/.bin/thumbsup /usr/local/bin/thumbsup
+
+# Default command, should be overridden during <docker run>
+CMD ["thumbsup"]

Dockerfile.test

@@ -15,4 +15,4 @@ RUN npm install
 COPY --chown=tester . /app
 
 # Run the tests
-RUN scripts/cibuild
+RUN npm test

scripts/cibuild

@@ -1,20 +0,0 @@
-#!/bin/bash
-
-# Fail the build on any error
-set -eou pipefail
-
-trap failure ERR
-function failure {
-  echo ""
-  echo "=================================="
-  echo " ✘ Build failed"
-  echo "=================================="
-}
-
-echo "Run unit tests"
-npm test
-
-echo ""
-echo "=================================="
-echo " ✔ Build successful"
-echo "=================================="