Add arm64 matrix job to Linux deps build workflow

Matrix build: x64 on ubuntu-22.04, arm64 on ubuntu-22.04-arm.
Arch selector input defaults to both.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: StuartCameronCode

.github/workflows/build-deps-linux.yml

@@ -11,13 +11,33 @@ on:
         description: 'Upload to this release tag (e.g., deps-v1.3.0). Leave empty to skip upload.'
         required: false
         type: string
+      arch:
+        description: 'Architecture'
+        required: false
+        type: choice
+        options:
+          - x64
+          - arm64
+          - both
+        default: both
 
 permissions:
   contents: write
 
 jobs:
   build-deps:
-    runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        include:
+          - os: ubuntu-22.04
+            arch: x64
+          - os: ubuntu-22.04-arm
+            arch: arm64
+      fail-fast: false
+
+    runs-on: ${{ matrix.os }}
+
+    if: ${{ inputs.arch == 'both' || inputs.arch == matrix.arch }}
 
     steps:
       - name: Checkout repository
@@ -41,19 +61,19 @@ jobs:
 
       - name: Package dependencies
         run: |
-          ./Scripts/package-deps-linux.sh --version "${{ inputs.version }}" --arch x64
+          ./Scripts/package-deps-linux.sh --version "${{ inputs.version }}" --arch ${{ matrix.arch }}
 
       - name: Upload artifact
         uses: actions/upload-artifact@v4
         with:
-          name: VapourBox-deps-${{ inputs.version }}-linux-x64
-          path: dist/VapourBox-deps-${{ inputs.version }}-linux-x64.zip
+          name: VapourBox-deps-${{ inputs.version }}-linux-${{ matrix.arch }}
+          path: dist/VapourBox-deps-${{ inputs.version }}-linux-${{ matrix.arch }}.zip
 
       - name: Upload to release
         if: ${{ inputs.release_tag != '' }}
         env:
           GH_TOKEN: ${{ github.token }}
         run: |
           gh release upload "${{ inputs.release_tag }}" \
-            "dist/VapourBox-deps-${{ inputs.version }}-linux-x64.zip" \
+            "dist/VapourBox-deps-${{ inputs.version }}-linux-${{ matrix.arch }}.zip" \
             --clobber