ci: Add win-arm64 static builds workflows

.github/workflows/static_build.yml

@@ -167,16 +167,26 @@ jobs:
           name: micromamba-${{ matrix.platform }}-${{ matrix.arch }}
           path: ${{ github.workspace }}/artifacts/micromamba
   micromamba-static-win:
-    name: "win-64"
-    runs-on: windows-latest
+    name: "win-${{ matrix.arch }}"
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - { os: windows-latest, arch: "64" }
+          - { os: windows-11-arm, arch: arm64 }
     steps:
       - uses: actions/checkout@v7
       - uses: hendrikmuhs/ccache-action@main
         with:
           variant: sccache
-          key: sccache-${{ github.job }}-win-64
+          key: sccache-${{ github.job }}-win-${{ matrix.arch }}
       - name: Set up MSVC
         uses: ilammy/msvc-dev-cmd@v1
+        with:
+          # Native ARM64 on windows-11-arm; x64 elsewhere. Default is x64 and
+          # linking ARM64 conda libs with an x64 linker fails with LNK4272.
+          arch: ${{ matrix.arch == 'arm64' && 'arm64' || 'x64' }}
       - uses: mamba-org/setup-micromamba@v3
         with:
           environment-name: mambabuild
@@ -226,34 +236,37 @@ jobs:
           if %errorlevel% neq 0 exit /b %errorlevel%
           .\build\micromamba\micromamba.exe --help
           if %errorlevel% neq 0 exit /b %errorlevel%
+      # binutils is not yet distributed for win-arm64 on conda-forge.
       - name: Install mingw objdump
+        if: matrix.arch != 'arm64'
         shell: bash -l {0}
         run: micromamba install -n mambabuild -y -c conda-forge binutils
       - name: Check micromamba PE dependencies
+        if: matrix.arch != 'arm64'
         shell: bash -l {0}
         run: bash dev/check_micromamba_windows_dlls.sh build/micromamba/micromamba.exe
       - name: build cache statistics
         run: sccache --show-stats
       - name: Archive-build artifact
         if: failure()
-        run: tar -czf ${{ github.workspace }}/micromamba-build-failed-win-64.tar.gz ${{ github.workspace }}/build/
+        run: tar -czf ${{ github.workspace }}/micromamba-build-failed-win-${{ matrix.arch }}.tar.gz ${{ github.workspace }}/build/
 
       - name: Test basic commands
         run: |
           mkdir test_prefix
           ${{ github.workspace }}/build/micromamba/micromamba.exe --version
           ${{ github.workspace }}/build/micromamba/micromamba.exe --help
-          ${{ github.workspace }}/build/micromamba/micromamba.exe env create -y -n testenv -r ./test_prefix "python<3.13"
+          ${{ github.workspace }}/build/micromamba/micromamba.exe env create -y -n testenv -r ./test_prefix "python=3.14"
           ${{ github.workspace }}/build/micromamba/micromamba.exe list -n testenv -r ./test_prefix  --log-level 1
 
       - name: Upload build artifacts
         uses: actions/upload-artifact@v7
         if: failure()
         with:
-          name: micromamba-build-failed-win-64
-          path: ${{ github.workspace }}/micromamba-build-failed-win-64.tar.gz
+          name: micromamba-build-failed-win-${{ matrix.arch }}
+          path: ${{ github.workspace }}/micromamba-build-failed-win-${{ matrix.arch }}.tar.gz
           retention-days: 7
       - uses: actions/upload-artifact@v7
         with:
-          name: micromamba-win-64
+          name: micromamba-win-${{ matrix.arch }}
           path: ${{ github.workspace }}/build/micromamba/micromamba.exe