create matrix from json

.github/workflows/test.yml

@@ -1,30 +1,38 @@
 name: Test
 on:
-  push:
-    branches: 
-      - main
-      - hotfix
-    paths:
-      - .github/workflows/test.yml
-      - Package.*
-      - Sources/**/*.swift
-      - Tests/**/*.swift
   pull_request:
     paths:
       - .github/workflows/test.yml
       - Package.*
       - Sources/**/*.swift
       - Tests/**/*.swift
+      - versions.json
+concurrency: 
+  group: ${{ github.ref }}-${{ github.workflow }}
+  cancel-in-progress: true
 jobs:
+  xcode-versions:
+    name: Extract latest Xcode version from matrix
+    runs-on: ubuntu-latest
+    outputs:
+      xcode-versions: ${{ steps.extract-xcode-version.outputs.xcode-versions }}
+      latest: ${{ steps.extract-xcode-version.outputs.latest-xcode-version }}
+    steps:
+      - uses: actions/checkout@v3
+      - id: extract-xcode-version
+        run: |
+          echo "::set-output name=xcode-versions::$(cat versions.json | jq -rc '.xcode_version')"
+          echo "::set-output name=latest-xcode-version::$(cat versions.json | jq -r '.xcode_version | max')"
   test:
     name: Test
+    needs: xcode-versions
     runs-on: macos-latest
     concurrency: 
       group: ${{ github.head_ref }}-${{ github.workflow }}-${{ matrix.xcode }}-${{ matrix.destination }}
       cancel-in-progress: true
     strategy:
       matrix:
-        xcode: ['13.2.1']
+        xcode: ${{ fromJson(needs.xcode-versions.outputs.xcode-versions) }}
         destination: 
           - "platform=macOS"
           - "platform=macOS,variant=Mac Catalyst"
@@ -59,7 +67,7 @@ jobs:
           clean test | xcpretty
       - name: Upload test result
         uses: actions/upload-artifact@v3
-        if: success() || failure()
+        if: ${{ matrix.xcode }} == ${{ needs.xcode-versions.outputs.latest }} && (success() || failure())
         with:
           name: ${{ steps.create-destination-key.outputs.destination-key }}
           path: test_output

versions.json

@@ -0,0 +1,5 @@
+{
+    "xcode_version": [
+        "13.2.1"
+    ]
+}