ci(release): cross-compile Windows binary on Linux runner (#445)

Replace the Windows runner with cross-compilation on a separate Linux
runner using x86_64-pc-windows-gnu. All three builds (Linux, Windows
cross-compile, macOS) run in parallel on their own runners.

Linux runners are faster and cheaper than Windows runners, speeding up
the release pipeline.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: jamesadevine

.github/workflows/release.yml

@@ -53,8 +53,7 @@ jobs:
       - name: Prepare release assets
         run: |
           set -euo pipefail
-          cd target/release
-          cp ado-aw ado-aw-linux-x64
+          cp target/release/ado-aw target/release/ado-aw-linux-x64
 
       - name: Package scripts bundle
         run: |
@@ -73,36 +72,37 @@ jobs:
             --clobber
 
   build-windows:
-    name: Build (Windows)
+    name: Build (Windows cross-compile)
     needs: release-please
     if: >-
       always() &&
       (needs.release-please.outputs.release_created == 'true' || github.event_name == 'workflow_dispatch')
-    runs-on: windows-2022
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - uses: dtolnay/rust-toolchain@631a55b12751854ce901bb631d5902ceb48146f7 # stable
+        with:
+          targets: x86_64-pc-windows-gnu
 
       - uses: Swatinem/rust-cache@9d47c6ad4b02e050fd481d890b2ea34778fd09d6 # v2.7.8
+        with:
+          key: windows-cross
 
-      - name: Build
-        run: cargo build --release --verbose
-
-      - name: Run tests
-        run: cargo test --verbose
+      - name: Install cross-compilation toolchain
+        run: sudo apt-get update && sudo apt-get install -y gcc-mingw-w64-x86-64
 
-      - name: Prepare release assets
-        run: |
-          Copy-Item target/release/ado-aw.exe target/release/ado-aw-windows-x64.exe
+      - name: Build
+        run: cargo build --release --target x86_64-pc-windows-gnu --verbose
 
       - name: Upload release assets
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
-          $TAG = "${{ needs.release-please.outputs.tag_name || github.event.inputs.tag_name }}"
-          gh release upload "$TAG" `
-            target/release/ado-aw-windows-x64.exe `
+          TAG="${{ needs.release-please.outputs.tag_name || github.event.inputs.tag_name }}"
+          cp target/x86_64-pc-windows-gnu/release/ado-aw.exe ado-aw-windows-x64.exe
+          gh release upload "$TAG" \
+            ado-aw-windows-x64.exe \
             --clobber
 
   build-macos-arm64: