Improve docker automation

Dockerfile

@@ -12,7 +12,6 @@ COPY Gemfile.lock /app/Gemfile.lock
 RUN bundle install
 
 RUN yarn install --check-files
-RUN yarn install
 
 COPY . /app
 

docker-compose.yml

@@ -6,6 +6,8 @@ services:
       - ./tmp/db:/var/lib/postgresql/data
   web:
     build: .
+    environment:
+      - UPDATE=0
     volumes:
       - .:/app
     ports:

docker-entrypoint.sh

@@ -3,15 +3,24 @@
 # Exit immediately if a command exits with a non-zero status.
 set -e
 
-# Create database, load schema, run migrations and seed data in an idempotent way.
-echo "Preparing database..."
-rake db:prepare
-echo "Database prepared."
+if [ "$UPDATE" = 1 ]; then
+  echo "UPDATE (yarn packages, db preparation and webpack compilation)"
 
-# Use webpack to build JS and CSS.
-echo "Compiling JS and CSS with webpack..."
-./bin/webpack
-echo "Webpack compilation completed."
+  # Launch yarn install
+  echo "Launching yarn install..."
+  yarn install
+  echo "yarn install successfully executed."
+
+  # Create database, load schema, run migrations and seed data in an idempotent way.
+  echo "Preparing database..."
+  rake db:prepare
+  echo "Database prepared."
+
+  # Use webpack to build JS and CSS.
+  echo "Compiling JS and CSS with webpack..."
+  ./bin/webpack
+  echo "Webpack compilation completed."
+fi
 
 # Remove a potentially pre-existing server.pid for Rails.
 rm -f /app/tmp/pids/server.pid

script/docker-build.sh

@@ -0,0 +1 @@
+docker-compose build

script/docker-run.sh

@@ -0,0 +1 @@
+docker-compose up "$@"

script/docker-update.sh

@@ -0,0 +1 @@
+docker-compose run --rm -e UPDATE=1 web echo "Update completed."