Fix public contestant form URLs creations (token -> contestant_id)

Dockerfile

@@ -51,19 +51,18 @@ RUN SECRET_KEY_BASE_DUMMY=1 ./bin/rails assets:precompile
 # Final stage for app image
 FROM base
 
+# Run and own only the runtime files as a non-root user for security
+RUN groupadd --system --gid 1000 rails && \
+    useradd rails --uid 1000 --gid 1000 --create-home --shell /bin/bash
+USER 1000:1000
+
 # Copy built artifacts: gems, application
-COPY --from=build "${BUNDLE_PATH}" "${BUNDLE_PATH}"
-COPY --from=build /rails /rails
+COPY --chown=rails:rails --from=build "${BUNDLE_PATH}" "${BUNDLE_PATH}"
+COPY --chown=rails:rails --from=build /rails /rails
 
 # TODO: find how not to depend on this hack to include the compiled SCSS.
 RUN cp app/assets/builds/application.css `ls public/assets/application-*.css`
 
-# Run and own only the runtime files as a non-root user for security
-RUN groupadd --system --gid 1000 rails && \
-    useradd rails --uid 1000 --gid 1000 --create-home --shell /bin/bash && \
-    chown -R rails:rails db log storage tmp
-USER 1000:1000
-
 # Entrypoint prepares the database.
 ENTRYPOINT ["/rails/bin/docker-entrypoint"]
 

app/controllers/contestants_controller.rb

@@ -154,7 +154,7 @@ class ContestantsController < ApplicationController
     @completion.completed = true
     @public = true
 
-    render "completions/_form", locals: { completion: @completion, submit_text: t("helpers.buttons.create"), method: :post, url: "/public/p/#{params[:token]}" }
+    render "completions/_form", locals: { completion: @completion, submit_text: t("helpers.buttons.create"), method: :post, url: "/public/p/#{params[:contestant_id]}" }
   end
 
   def post_public_completion
@@ -176,14 +176,14 @@ class ContestantsController < ApplicationController
     end
     if @completion.save
       extend_completions!(@completion.contestant)
-      redirect_to "/public/p/#{params[:token]}/updated"
+      redirect_to "/public/p/#{params[:contestant_id]}/updated"
     else
       @puzzles = @contest.puzzles
       @public = true
       if to_modify
         @completion.code = nil
       end
-      render "completions/_form", locals: { completion: @completion, submit_text: t("helpers.buttons.create"), method: :post, url: "/public/p/#{params[:token]}" }, status: :unprocessable_entity
+      render "completions/_form", locals: { completion: @completion, submit_text: t("helpers.buttons.create"), method: :post, url: "/public/p/#{params[:contestant_id]}" }, status: :unprocessable_entity
     end
   end