Use runner.arch instead of runner image names in Windows conditions

Gating steps on the exact matrix image name (windows-latest,
windows-11-arm) breaks silently whenever the image in the matrix is
renamed, as happened with the windows-2022 switch. runner.os and
runner.arch describe what we actually care about and are independent
of the image label.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PWvFPqUcXUzsYf3DY7RziJ

.github/workflows/build.yml

@@ -48,10 +48,10 @@ jobs:
 
       # This global ffmpeg is used for screenshots (see below)
       - uses: AnimMouse/setup-ffmpeg@v1
-        if: matrix.os != 'windows-11-arm' && env.is_tag == 'false'
+        if: (runner.os != 'Windows' || runner.arch != 'ARM64') && env.is_tag == 'false'
 
       - run: ffmpeg -version
-        if: matrix.os != 'windows-11-arm'
+        if: runner.os != 'Windows' || runner.arch != 'ARM64'
 
        # Because of timeout issue https://github.com/yarnpkg/yarn/issues/4890
       - run: yarn install --immutable --network-timeout 1000000
@@ -81,11 +81,11 @@ jobs:
           yarn download-ffmpeg-darwin-arm64
 
       - name: (Windows x64) Download ffmpeg
-        if: runner.os == 'Windows' && matrix.os != 'windows-11-arm'
+        if: runner.os == 'Windows' && runner.arch == 'X64'
         run: yarn download-ffmpeg-win32-x64
 
       - name: (Windows ARM64) Download ffmpeg
-        if: matrix.os == 'windows-11-arm'
+        if: runner.os == 'Windows' && runner.arch == 'ARM64'
         run: yarn download-ffmpeg-win32-arm64
 
       - name: (Linux) Download ffmpeg
@@ -116,13 +116,13 @@ jobs:
           GH_TOKEN: ${{ secrets.github_token }}
 
       - name: Build for Windows x64
-        if: runner.os == 'Windows' && matrix.os != 'windows-11-arm'
+        if: runner.os == 'Windows' && runner.arch == 'X64'
         run: yarn electron-builder --publish onTag --win --x64
         env:
           GH_TOKEN: ${{ secrets.github_token }}
 
       - name: Build for Windows ARM64
-        if: matrix.os == 'windows-11-arm'
+        if: runner.os == 'Windows' && runner.arch == 'ARM64'
         run: yarn electron-builder --publish onTag --win --arm64
         env:
           GH_TOKEN: ${{ secrets.github_token }}
@@ -131,7 +131,7 @@ jobs:
         if: runner.os == 'macOS' && env.is_tag == 'false'
 
       - run: node script/e2e.ts 'dist\win-unpacked\LosslessCut.exe' desktop screenshot.jpeg
-        if: runner.os == 'Windows' && matrix.os != 'windows-11-arm' && env.is_tag == 'false'
+        if: runner.os == 'Windows' && runner.arch == 'X64' && env.is_tag == 'false'
 
       - run: |
           export DISPLAY=:0
@@ -170,10 +170,10 @@ jobs:
           ACTIONS_RUNTIME_TOKEN: ${{ env.ACTIONS_RUNTIME_TOKEN }}
           ACTIONS_RESULTS_URL: ${{ env.ACTIONS_RESULTS_URL }}
         run: |
-          yarn upload-artifacts dist/LosslessCut-win-${{ matrix.os == 'windows-11-arm' && 'arm64' || 'x64' }}.7z
+          yarn upload-artifacts dist/LosslessCut-win-${{ runner.arch == 'ARM64' && 'arm64' || 'x64' }}.7z
 
       - name: (Windows x64) Upload screenshot
-        if: runner.os == 'Windows' && matrix.os != 'windows-11-arm' && env.is_tag == 'false'
+        if: runner.os == 'Windows' && runner.arch == 'X64' && env.is_tag == 'false'
         env:
           ACTIONS_RUNTIME_TOKEN: ${{ env.ACTIONS_RUNTIME_TOKEN }}
           ACTIONS_RESULTS_URL: ${{ env.ACTIONS_RESULTS_URL }}