CIにlibheifを追加してHEICテストのskipを削除

- CircleCIにlibheif-devをインストールしてHEICサポートを有効化
- テストからskipとheic_supported?ヘルパーを削除

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: komagata

.circleci/config.yml

@@ -40,8 +40,8 @@ jobs:
           name: Update package list
           command: sudo apt-get update
       - run:
-          name: Install libvips
-          command: sudo apt-get install -y libvips
+          name: Install libvips and libheif
+          command: sudo apt-get install -y libvips libheif-dev
       - run:
           name: Traceroute
           command: FAIL_ON_ERROR=1 bundle exec rake traceroute
@@ -95,8 +95,8 @@ jobs:
           name: Install japanese font
           command: sudo apt-get install -y fonts-noto-cjk
       - run:
-          name: Install libvips
-          command: sudo apt-get install -y libvips
+          name: Install libvips and libheif
+          command: sudo apt-get install -y libvips libheif-dev
       - run:
           name: Wait for DB
           command: 'dockerize -wait tcp://localhost:5432 -timeout 1m'

test/system/users/profile_test.rb

@@ -162,8 +162,6 @@ class ProfileTest < ApplicationSystemTestCase
     end
 
     test 'can upload heic image and converts it to webp with login_name' do
-      skip 'HEICのサポートがないため、スキップします。' unless heic_supported?
-
       visit_with_auth '/current_user/edit', 'hajime'
       attach_file 'user[avatar]', 'test/fixtures/files/images/heic-sample-file.heic', make_visible: true
       click_button '更新する'
@@ -203,13 +201,5 @@ class ProfileTest < ApplicationSystemTestCase
       assert_selector 'h2.card-header__title', text: '主な活動予定時間'
     end
 
-    private
-
-    def heic_supported?
-      Vips::Image.new_from_file('test/fixtures/files/images/heic-sample-file.heic')
-      true
-    rescue Vips::Error
-      false
-    end
   end
 end