controllers: use template: rather than file: to render PDFs

ActionView now throws an error if a relative path is used with `file:`.

app/controllers/api/v2/dossiers_controller.rb

@@ -3,7 +3,7 @@ class API::V2::DossiersController < API::V2::BaseController
 
   def pdf
     @include_infos_administration = true
-    render(file: 'dossiers/show', formats: [:pdf])
+    render(template: 'dossiers/show', formats: [:pdf])
   end
 
   def geojson

app/controllers/instructeurs/dossiers_controller.rb

@@ -42,7 +42,7 @@ module Instructeurs
       respond_to do |format|
         format.pdf do
           @include_infos_administration = true
-          render(file: 'dossiers/show', formats: [:pdf])
+          render(template: 'dossiers/show', formats: [:pdf])
         end
         format.all
       end
@@ -235,7 +235,7 @@ module Instructeurs
 
     def generate_pdf_for_instructeur_export
       @include_infos_administration = true
-      pdf = render_to_string(file: 'dossiers/show', formats: [:pdf])
+      pdf = render_to_string(template: 'dossiers/show', formats: [:pdf])
       dossier.pdf_export_for_instructeur.attach(io: StringIO.open(pdf), filename: "export-#{dossier.id}.pdf", content_type: 'application/pdf')
     end
 

app/controllers/users/commencer_controller.rb

@@ -82,7 +82,7 @@ module Users
 
     def generate_empty_pdf(procedure)
       @dossier = procedure.new_dossier
-      s = render_to_string(file: 'dossiers/dossier_vide', formats: [:pdf])
+      s = render_to_string(template: 'dossiers/dossier_vide', formats: [:pdf])
       send_data(s, :filename => "#{procedure.libelle}.pdf")
     end
   end

app/controllers/users/dossiers_controller.rb

@@ -32,7 +32,7 @@ module Users
       respond_to do |format|
         format.pdf do
           @include_infos_administration = false
-          render(file: 'dossiers/show', formats: [:pdf])
+          render(template: 'dossiers/show', formats: [:pdf])
         end
         format.all
       end