Add docker instructions

.dockerignore

@@ -0,0 +1,5 @@
+*.sqlite3
+*.sqlite3-shm
+*.sqlite3-wal
+certs/
+.DS_Store

Dockerfile

@@ -0,0 +1,22 @@
+FROM ruby:3.2.2-slim
+
+RUN apt-get update -qq && apt-get install -y build-essential libsqlite3-dev openssl
+
+WORKDIR /usr/src/app
+
+COPY Gemfile* ./
+
+RUN bundle config set without 'development test' && bundle install
+
+COPY . .
+
+EXPOSE 9292
+
+ENV RACK_ENV=production
+
+RUN mkdir -p certs && \
+    openssl req -x509 -newkey rsa:4096 -keyout certs/server.key -out certs/server.crt -days 365 -nodes -subj '/CN=localhost'
+
+RUN rake db:migrate
+
+CMD ["puma", "-C", "app/config/puma.rb"]

README.md

@@ -83,6 +83,36 @@ To start the application, run the following command in your terminal:
 puma -C app/config/puma.rb
 ```
 
+### Docker 
+
+In order to start the docker container you need 3 enviromental variables:
+
+```bash
+TUDUDI_USER_EMAIL
+TUDUDI_USER_PASSWORD
+TUDUDI_SESSION_SECRET
+```
+
+**PLEASE NOTE:** I am generating a new SSL certificate inside the Dockerfile. There will be an option to create and link an externally generated one in the future - at this stage I am doing this for simplicity.
+
+1. Create a random session secret and copy the hash to use it as a `TUDUDI_SESSION_SECRET`:
+    ```bash
+    openssl rand -hex 64
+    ```
+
+2. Run the docker command with your produced hash at the previous step:
+    ```bash
+    docker run -e TUDUDI_USER_EMAIL=myemail@example.com 
+    -e TUDUDI_USER_PASSWORD=mysecurepassword  
+    -e TUDUDI_SESSION_SECRET=3337c138d17ac7acefa412e5db0d7ef6540905b198cc28c5bf0d11e48807a71bdfe48d82ed0a0a6eb667c937cbdd1db3e1e6073b3148bff37f73cc6398a39671 
+    -v ~/tududi_db:/db 
+    -p 9292:9292 
+    -d tududi
+    ```
+
+3. Navigate to https://localhost:9292 and fill in your email and password.
+4. Enjoy
+
 ### Testing 
 
 To run tests:

app.rb

@@ -25,9 +25,16 @@ set :public_folder, 'public'
 configure do
   enable :sessions
   set :sessions, httponly: true, secure: production?, expire_after: 2_592_000
-  set :session_secret, ENV.fetch('SESSION_SECRET') { SecureRandom.hex(64) }
-  set :session_secret,
-      '740cca863278d6cbacb64dbdd41cfdb1598e8208ce9b9d29b0a1e7c1e1367ca1241d8048849ee88784731d43879c94f5b9f0a639135828d590a447acb2d98e1c'
+  set :session_secret, ENV.fetch('TUDUDI_SESSION_SECRET') { SecureRandom.hex(64) }
+
+  # Auto-create user if not exists
+  if ENV['TUDUDI_USER_EMAIL'] && ENV['TUDUDI_USER_PASSWORD']
+    user = User.find_or_initialize_by(email: ENV['TUDUDI_USER_EMAIL'])
+    if user.new_record?
+      user.password = ENV['TUDUDI_USER_PASSWORD']
+      user.save
+    end
+  end
 end
 
 use Rack::Protection
@@ -85,4 +92,4 @@ end
 
 get '/inbox' do
   erb :inbox
-end
+end