Cache the install of msys2.

Author: kyle-github

.github/workflows/aarch64-pc-windows-gnu.yml

@@ -3,27 +3,16 @@ name: aarch64-pc-windows-gnu
 on: [push, pull_request]
 
 jobs:
-  setup-aarch64-pc-windows-gnu:
-    runs-on: windows-11-arm
-    steps:
-      - uses: actions/checkout@v4
-      - name: Setup MinGW
-        uses: msys2/setup-msys2@v2
-        with:
-          msystem: CLANGARM64
-          update: true
-          install: mingw-w64-clang-aarch64-toolchain mingw-w64-clang-aarch64-cmake
-
   build-aarch64-pc-windows-gnu:
     runs-on: windows-11-arm
-    needs: setup-aarch64-pc-windows-gnu
     steps:
       - uses: actions/checkout@v4
       - name: Setup MinGW
         uses: msys2/setup-msys2@v2
         with:
           msystem: CLANGARM64
           update: true
+          cache: true
           install: mingw-w64-clang-aarch64-toolchain mingw-w64-clang-aarch64-cmake
       - name: Configure
         shell: msys2 {0}
@@ -49,6 +38,7 @@ jobs:
         with:
           msystem: CLANGARM64
           update: true
+          cache: true
           install: mingw-w64-clang-aarch64-toolchain mingw-w64-clang-aarch64-cmake
       - name: Download build artifacts
         uses: actions/download-artifact@v4

.github/workflows/x86_64-pc-windows-gnu.yml

@@ -3,27 +3,16 @@ name: x86_64-pc-windows-gnu
 on: [push, pull_request]
 
 jobs:
-  setup-x86_64-pc-windows-gnu:
-    runs-on: windows-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Setup MinGW
-        uses: msys2/setup-msys2@v2
-        with:
-          msystem: MINGW64
-          update: true
-          install: mingw-w64-x86_64-toolchain mingw-w64-x86_64-cmake
-
   build-x86_64-pc-windows-gnu:
     runs-on: windows-latest
-    needs: setup-x86_64-pc-windows-gnu
     steps:
       - uses: actions/checkout@v4
       - name: Setup MinGW
         uses: msys2/setup-msys2@v2
         with:
           msystem: MINGW64
           update: true
+          cache: true
           install: mingw-w64-x86_64-toolchain mingw-w64-x86_64-cmake
       - name: Configure
         shell: msys2 {0}
@@ -49,6 +38,7 @@ jobs:
         with:
           msystem: MINGW64
           update: true
+          cache: true
           install: mingw-w64-x86_64-toolchain mingw-w64-x86_64-cmake
       - name: Download build artifacts
         uses: actions/download-artifact@v4