Setup Docker for Local Development Environment (#125)

Dockerfile

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+# https://hub.docker.com/_/ruby
+FROM ruby:3.0
+
+# throw errors if Gemfile has been modified since Gemfile.lock
+RUN bundle config --global frozen 1
+
+WORKDIR /usr/src/app
+
+# copy gems first to cache bundle install
+COPY Gemfile Gemfile.lock ./
+RUN bundle install
+
+# copy whole repo into the image
+COPY . .

docker-compose.yml

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+version: '3'
+services:
+  jekyll:
+    container_name: jekyll-server
+    build:
+      context: .
+      dockerfile: Dockerfile
+    image: merl-center:v1
+    # host flag allows Jekyll server to be accessed from outside the container
+    command: bundle exec jekyll serve --livereload --host=0.0.0.0
+    # volume allows changes to be seen on localhost immediately instead of having to delete and rebuild image
+    volumes:
+      - .:/usr/src/app
+    ports:
+      - 4000:4000
+      - 35729:35729 # port for livereload