chore: add docker healthcheck for worker and server

Dockerfile

@@ -9,7 +9,7 @@ WORKDIR /rails
 
 # Install base packages
 RUN apt-get update -qq \
-    && apt-get install --no-install-recommends -y curl libvips postgresql-client libyaml-0-2 procps \
+    && apt-get install --no-install-recommends -y curl libvips postgresql-client libyaml-0-2 procps\
     && rm -rf /var/lib/apt/lists /var/cache/apt/archives
 
 # Set production environment
@@ -58,6 +58,9 @@ COPY --chown=rails:rails --from=build /rails /rails
 # Entrypoint prepares the database.
 ENTRYPOINT ["/rails/bin/docker-entrypoint"]
 
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+  CMD curl --fail http://localhost:3000/healthcheck || exit 1
+
 # Start the server by default, this can be overwritten at runtime
 EXPOSE 3000
 CMD ["./bin/rails", "server"]

app/controllers/health_controller.rb

@@ -0,0 +1,52 @@
+class HealthController < ApplicationController
+  skip_before_action :verify_authenticity_token
+  skip_before_action :authenticate_user!
+  skip_before_action :set_request_details
+  skip_before_action :set_sentry_user
+  skip_before_action :verify_self_host_config
+
+  # Silence logging for liveliness endpoint
+  around_action :silence_logger, only: :liveliness
+
+  def healthcheck
+    checks = {
+      database: check_database,
+      redis: check_redis
+    }
+
+    all_healthy = checks.values.all?
+
+    status = all_healthy ? :ok : :service_unavailable
+    render json: checks, status: status
+  end
+
+  def liveliness
+    head :ok
+  end
+
+  private
+
+    def check_database
+      ActiveRecord::Base.connection.execute("SELECT 1")
+      true
+    rescue StandardError => e
+      Rails.logger.error("Database health check failed: #{e.message}")
+      false
+    end
+
+    def check_redis
+      Sidekiq.redis(&:ping)
+      true
+    rescue StandardError => e
+      Rails.logger.error("Redis health check failed: #{e.message}")
+      false
+    end
+
+    def silence_logger
+      old_level = Rails.logger.level
+      Rails.logger.level = Logger::UNKNOWN
+      yield
+    ensure
+      Rails.logger.level = old_level
+    end
+end

compose.example.yml

@@ -52,6 +52,13 @@ services:
     ports:
       - 3000:3000
     restart: unless-stopped
+    healthcheck:
+      test: [ "CMD-SHELL", "curl -f http://0.0.0.0:3000 || exit 1" ]
+      start_period: 10s
+      start_interval: 10s
+      interval: 10s
+      timeout: 5s
+      retries: 3
     environment:
       <<: *rails_env
     depends_on:
@@ -73,6 +80,12 @@ services:
         condition: service_healthy
       redis:
         condition: service_healthy
+    healthcheck:
+      test: [ "CMD-SHELL", "pgrep -f sidekiq || exit 1" ]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+      start_period: 10s
     environment:
       <<: *rails_env
     networks:

config/routes.rb

@@ -333,6 +333,10 @@
   # Can be used by load balancers and uptime monitors to verify that the app is live.
   get "up" => "rails/health#show", as: :rails_health_check
 
+  # Health check endpoints
+  get "healthcheck", to: "health#healthcheck"
+  get "liveliness", to: "health#liveliness"
+
   # Render dynamic PWA files from app/views/pwa/*
   get "service-worker" => "rails/pwa#service_worker", as: :pwa_service_worker
   get "manifest" => "rails/pwa#manifest", as: :pwa_manifest