Remove excessive CI and simplify setup accordingly

Author: ararslan

.github/workflows/ci.yml

@@ -6,31 +6,21 @@ on:
   pull_request:
 jobs:
   test:
-    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
-    runs-on: ${{ matrix.os }}
+    name: Julia ${{ matrix.version }} - ${{ github.event_name }}
+    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
         version:
           - '1.0'
           - '1'
           - 'nightly'
-        os:
-          - ubuntu-latest
-          - macOS-latest
-          - windows-latest
-        arch:
-          - x64
-          - x86
-        exclude:
-          - os: macOS-latest
-            arch: x86
     steps:
       - uses: actions/checkout@v3
       - uses: julia-actions/setup-julia@v1
         with:
           version: ${{ matrix.version }}
-          arch: ${{ matrix.arch }}
+          arch: x64
       - uses: julia-actions/cache@v1
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1