Use Arch-based CI workflow

.github/workflows/build.yml

@@ -8,33 +8,35 @@ on:
   pull_request:
 
 jobs:
-  linux-build:
+  arch-build:
     runs-on: ubuntu-24.04
 
     steps:
       - name: Check out repository
         uses: actions/checkout@v4
 
-      - name: Install dependencies
+      - name: Build in Arch Linux container
         run: |
-          sudo apt-get update
-          sudo apt-get install -y \
-            cmake \
-            ninja-build \
-            pkg-config \
-            qt6-base-dev \
-            qt6-declarative-dev \
-            qt6-tools-dev-tools \
-            libkf6coreaddons-dev \
-            libkf6i18n-dev \
-            libkf6kirigami-dev \
-            phonon4qt6-dev
-
-      - name: Configure
-        run: cmake -S . -B build-ci -GNinja -DCMAKE_BUILD_TYPE=Release
-
-      - name: Build
-        run: cmake --build build-ci
-
-      - name: Lint QML
-        run: qmllint src/qml/Main.qml
+          docker run --rm \
+            -v "${GITHUB_WORKSPACE}:/workspace" \
+            -w /workspace \
+            archlinux:latest \
+            bash -lc '
+              set -euo pipefail
+              pacman -Syu --noconfirm
+              pacman -S --noconfirm --needed \
+                base-devel \
+                cmake \
+                extra-cmake-modules \
+                git \
+                qt6-base \
+                qt6-declarative \
+                qt6-tools \
+                kirigami \
+                kcoreaddons \
+                ki18n \
+                phonon-qt6
+              cmake -S . -B build -DCMAKE_BUILD_TYPE=Release
+              cmake --build build -j"$(nproc)"
+              "$(/usr/lib/qt6/bin/qtpaths6 --query QT_INSTALL_BINS)/qmllint" src/qml/Main.qml
+            '