diff --git a/.github/workflows/docker_build.yml b/.github/workflows/docker_build.yml
new file mode 100644
index 00000000..6c94e191
--- /dev/null
+++ b/.github/workflows/docker_build.yml
@@ -0,0 +1,16 @@
+name: Docker Build
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    services:
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build docker
+        run: docker build .
+      - name: Test docker compose
+        run: docker-compose up -d
+      - name: Check server is up
+        run: curl -s http://localhost:3000
diff --git a/Dockerfile b/Dockerfile
index f3943b14..191025b2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.7 AS builder
+FROM ruby:3.2 AS builder
 
 RUN apt-get update && apt-get upgrade -y && apt-get install -y ca-certificates curl gnupg && \
     curl -fsSL https://deb.nodesource.com/setup_21.x | bash - && \
@@ -64,7 +64,7 @@ RUN mv config/credentials.bak config/credentials 2>/dev/null || true
 RUN rm -rf tmp/cache vendor/bundle test spec .git
 
 # This image is for production env only
-FROM ruby:2.7-slim AS final
+FROM ruby:3.2-slim AS final
 
 RUN apt-get update && \
     apt-get install -y postgresql-client \
diff --git a/Gemfile b/Gemfile
index d3790e4a..09e9249b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -26,6 +26,7 @@ gem 'aws-sdk-s3', '~> 1.94', require: false
 gem 'image_processing', '~> 1.12'
 gem 'active_storage_validations', '~> 1.1.3'
 gem "puma", ">= 5.0.0"
+gem 'matrix', '~> 0.4.1'
 
 # Assets
 gem 'jquery-rails', '~> 4.4.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 68107a4e..b0d22f46 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -452,6 +452,7 @@ DEPENDENCIES
   kaminari (~> 1.2.1)
   letter_opener (~> 1.7.0)
   localeapp (~> 3.3)
+  matrix (~> 0.4.1)
   pg (~> 1.4)
   pg_search (~> 2.3.5)
   prawn (~> 2.4.0)
diff --git a/app/assets/javascripts/libs.js b/app/assets/javascripts/libs.js
index 1c941bd1..7f1ebda1 100644
--- a/app/assets/javascripts/libs.js
+++ b/app/assets/javascripts/libs.js
@@ -1,7 +1,7 @@
 //= require jquery2
 //= require jquery_ujs
-//= require jquery.validate
+//= require vendor/jquery.validate
 //= require bootstrap
-//= require highcharts
-//= require highcharts-exporting
+//= require vendor/highcharts
+//= require vendor/highcharts-exporting
 //= require select2
diff --git a/config/application.rb b/config/application.rb
index b98b2311..40e52935 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -31,6 +31,7 @@ class Application < Rails::Application
     config.active_record.schema_format = :sql
 
     # Guard against DNS rebinding attacks by permitting hosts
+    # localhost is necessary for the docker image
     config.hosts << 'localhost'
     config.hosts << 'timeoverflow.local'
     config.hosts << 'staging.timeoverflow.org'
diff --git a/config/environments/production.rb b/config/environments/production.rb
index 34ae293a..51695aff 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -1,3 +1,4 @@
+# Uglifier is only used on the precompile phase, so we can require it conditionally
 require "uglifier" if ENV["SECRET_KEY_BASE"] == "dummy"
 
 Rails.application.configure do
@@ -57,9 +58,7 @@
 
   # Use the lowest log level to ensure availability of diagnostic information
   # when problems arise.
-  config.log_level = if %w(debug info warn error
-                           fatal).include?(ENV.fetch("RAILS_LOG_LEVEL",
-                                                     nil))
+  config.log_level = if %w(debug info warn error fatal).include?(ENV.fetch("RAILS_LOG_LEVEL", nil))
                        ENV["RAILS_LOG_LEVEL"]
                      else
                        :info