diff --git a/Dockerfile b/Dockerfile
index e5eda29..7f0d26b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,6 +7,7 @@ ARG base_commit=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
 FROM ruby:${RUBY_VERSION}-slim AS runtime-base
 
 ARG BUNDLER_VERSION
+ARG DEBIAN_FRONTEND=noninteractive
 
 ENV LANG=C.UTF-8 \
     BUNDLE_JOBS=4 \
@@ -28,6 +29,8 @@ RUN apt-get update -qq \
 
 FROM runtime-base AS build-base
 
+ARG DEBIAN_FRONTEND=noninteractive
+
 RUN apt-get update -qq \
     && apt-get install -y --no-install-recommends \
         build-essential \
@@ -37,7 +40,6 @@ RUN apt-get update -qq \
         libyaml-dev \
         pkg-config \
         python3 \
-        python3-pip \
     && rm -rf /var/lib/apt/lists/*
 
 COPY Gemfile Gemfile.lock ./
@@ -84,6 +86,7 @@ CMD ["sh", "-lc", "bundle exec rails db:migrate && bundle exec rails s -p 3000 -
 FROM runtime-base AS test
 
 ARG base_commit=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+ARG DEBIAN_FRONTEND=noninteractive
 
 ENV RAILS_ENV=test \
     GIT_COMMIT_SHA=${base_commit}
@@ -92,9 +95,8 @@ RUN apt-get update -qq \
     && apt-get install -y --no-install-recommends \
         libsqlite3-0 \
         python3 \
-        python3-pip \
-    && rm -rf /var/lib/apt/lists/* \
-    && python3 -m pip install --break-system-packages --no-cache-dir invoke
+        python3-invoke \
+    && rm -rf /var/lib/apt/lists/*
 
 COPY --from=bundle-test /usr/local/bundle /usr/local/bundle
 COPY --from=bundle-test /app/vendor/bundle /app/vendor/bundle
diff --git a/config/application.rb b/config/application.rb
index e6e619b..dbdbb57 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -36,6 +36,7 @@ module TurniereBackend
     config.api_only = true
     config.action_cable.disable_request_forgery_protection = true
     config.action_cable.allowed_request_origins = [%r{\Ahttps?://.*\z}]
+    config.active_storage.variant_processor = :disabled
 
     config.middleware.insert_before 0, Rack::Cors do
       allow do
diff --git a/db/seeds.rb b/db/seeds.rb
index a5ed829..9245444 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -1,26 +1,34 @@
 # frozen_string_literal: true
 
-require 'faker'
+if Rails.env.production? && ENV.fetch('TURNIERE_ENABLE_DEMO_SEEDS', nil) != '1'
+  warn 'Skipping demo seeds in production. Set TURNIERE_ENABLE_DEMO_SEEDS=1 to force them.'
+else
+  begin
+    require 'faker'
+  rescue LoadError
+    warn 'Skipping demo seeds because faker is unavailable.'
+  else
+    user = User.create! username: Faker::Internet.username, email: Faker::Internet.email, password: Faker::Internet.password
+    tournament = user.tournaments.create! name: Faker::Creature::Dog.name
 
-user = User.create! username: Faker::Internet.username, email: Faker::Internet.email, password: Faker::Internet.password
-tournament = user.tournaments.create! name: Faker::Creature::Dog.name
-
-@teams = []
-16.times do
-  team = tournament.teams.create! name: Faker::Movies::HarryPotter.character
-  @teams << team
-end
-4.times do |i|
-  stage = tournament.stages.create!
-  stage.level = i
-  matches_amount = 2**i
-  matches_amount.times do |j|
-    match = stage.matches.create!
-    match.match_scores.create! team: @teams.sample, points: rand(10)
-    match.match_scores.create! team: @teams.sample, points: rand(10)
-    match.position = j
-    match.state = rand(5)
-    match.save!
+    @teams = []
+    16.times do
+      team = tournament.teams.create! name: Faker::Movies::HarryPotter.character
+      @teams << team
+    end
+    4.times do |i|
+      stage = tournament.stages.create!
+      stage.level = i
+      matches_amount = 2**i
+      matches_amount.times do |j|
+        match = stage.matches.create!
+        match.match_scores.create! team: @teams.sample, points: rand(10)
+        match.match_scores.create! team: @teams.sample, points: rand(10)
+        match.position = j
+        match.state = rand(5)
+        match.save!
+      end
+      stage.save!
+    end
   end
-  stage.save!
 end