Use a manifest file to install dependencies

[refs #44712567f522]
learndocker · May 5, 2018 · 5519300 · 5519300
1 parent 9c4d342
commit 5519300
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diff --git a/developing/webapp/Dockerfile b/developing/webapp/Dockerfile
@@ -2,9 +2,12 @@ FROM ruby:2.4.3-alpine
 
 WORKDIR /app
 
-RUN apk update && apk add build-base postgresql-dev
-RUN gem install sinatra pg
+RUN apk add --no-cache \
+      build-base \
+      postgresql-dev
 
-COPY app.rb .
+COPY . .
+
+RUN bundle install
 
 CMD ["ruby", "app.rb"]
diff --git a/developing/webapp/Gemfile b/developing/webapp/Gemfile
@@ -0,0 +1,5 @@
+source 'https://rubygems.org'
+
+gem 'sinatra', '2.0'
+gem 'pg', '1.0.0'
+