Update CI to setup-gap@v3 + expand to multiple OS's and GAP versions

Author: stertooy

.github/workflows/CI.yml

@@ -9,18 +9,30 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        gap-version:
+          - devel
+          - v4.15.0-beta1
+          - v4.14
+          - v4.13
+          - v4.12
+          - v4.11
+          - v4.10
 
     steps:
       # the order of the checkout actions is important because all contents of
       # the target folder of the checkout action is removed
+      - uses: gap-actions/setup-cygwin@v2
+        if: ${{ matrix.os == 'windows-latest' }}
       - uses: actions/checkout@v5
         with:
-          repository: gap-packages/profiling
+          repository: gap-packages/example
       - uses: actions/checkout@v5
         with:
           path: this-action/
-      - uses: gap-actions/setup-gap@v2
-        with:
-          GAP_PKGS_TO_BUILD: 'io'
+      - uses: gap-actions/setup-gap@v3
       - uses: ./this-action/