[CI] Change how we define the matrix

# Motivation

# Modification

# Result

Author: FranzBusch

.github/workflows/pull_request.yml

@@ -16,7 +16,7 @@ jobs:
   unit-tests:
     name: Unit tests
     # Workaround https://github.com/nektos/act/issues/1875
-    uses: apple/swift-nio/.github/workflows/unit_tests.yml@main
+    uses: ./.github/workflows/unit_tests.yml
     with:
       linux_5_9_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
       linux_5_10_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"

.github/workflows/swift_matrix.yml

@@ -148,31 +148,93 @@ jobs:
           apt-get -qq update && apt-get -qq -y install curl
           curl -s https://raw.githubusercontent.com/apple/swift-nio/main/scripts/check-matrix-job.sh | bash
 
+  generate-matrix:
+    runs-on: ubuntu-latest
+    outputs:
+      linux-matrix: ${{ steps.set-matrix.outputs.linux-matrix }}
+      windows-matrix: ${{ steps.set-matrix.outputs.windows-matrix }}
+      windows-nightly-matrix: ${{ steps.set-matrix.outputs.windows-nightly-matrix }}
+    steps:
+      - id: set-matrix
+        env:
+          LINUX_5_9_ENABLED: ${{ inputs.matrix_linux_5_9_enabled }}
+          LINUX_5_10_ENABLED: ${{ inputs.matrix_linux_5_10_enabled }}
+          LINUX_6_0_ENABLED: ${{ inputs.matrix_linux_6_0_enabled }}
+          LINUX_NIGHTLY_6_0_ENABLED: ${{ inputs.matrix_linux_nightly_6_0_enabled }}
+          LINUX_NIGHTLY_MAIN_ENABLED: ${{ inputs.matrix_linux_nightly_main_enabled }}
+          WINDOWS_6_0_ENABLED: ${{ inputs.matrix_windows_6_0_enabled }}
+          WINDOWS_NIGHTLY_6_0_ENABLED: ${{ inputs.matrix_windows_nightly_6_0_enabled }}
+          WINDOWS_NIGHTLY_MAIN_ENABLED: ${{ inputs.matrix_windows_nightly_main_enabled }}
+        run: |
+          # Linux matrix
+          linux_matrix='{"swift": []}'
+          if [[ "${LINUX_5_9_ENABLED}" == "true" ]]; then
+              linux_matrix=$(echo "$linux_matrix" | jq '.swift[.swift| length] |= . + { "image": "${{ inputs.matrix_linux_5_9_container_image }}", "swift_version": "5.9" }')
+          elif [[ "${LINUX_5_10_ENABLED}" == "true" ]]; then
+              linux_matrix=$(echo "$linux_matrix" | jq '.swift[.swift| length] |= . + { "image": "${{ inputs.matrix_linux_5_10_container_image }}", "swift_version": "5.10" }')
+          elif [[ "${LINUX_6_0_ENABLED}" == "true" ]]; then
+              linux_matrix=$(echo "$linux_matrix" | jq '.swift[.swift| length] |= . + { "image": "${{ inputs.matrix_linux_6_0_container_image }}", "swift_version": "6.0" }')
+          elif [[ "${LINUX_NIGHTLY_6_0_ENABLED}" == "true" ]]; then
+              linux_matrix=$(echo "$linux_matrix" | jq '.swift[.swift| length] |= . + { "image": "${{ inputs.matrix_linux_nightly_6_0_container_image }}", "swift_version": "nightly-6.0" }')
+          elif [[ "${LINUX_NIGHTLY_MAIN_ENABLED}" == "true" ]]; then
+              linux_matrix=$(echo "$linux_matrix" | jq '.swift[.swift| length] |= . + { "image": "${{ inputs.matrix_linux_nightly_main_container_image }}", "swift_version": "nightly-main" }')
+          fi
+
+          {
+            echo 'linx-matrix<<EOF'
+            echo $linux_matrix
+            echo EOF
+          } >> "$GITHUB_OUTPUT"
+
+          # Windows matrix
+          windows_matrix='{"swift": []}'
+          if [[ "${WINDOWS_6_0_ENABLED}" == "true" ]]; then
+              windows_matrix=$(echo "$windows_matrix" | jq '.swift[.swift| length] |= . + { "image": "swift:6.0-windowsservercore-ltsc2022", "swift_version": "6.0" }')
+          fi
+
+          {
+            echo 'windows-matrix<<EOF'
+            echo $windows_matrix
+            echo EOF
+          } >> "$GITHUB_OUTPUT"
+
+          # Windows nightly matrix
+          windows_nightly_matrix='{"swift": []}'
+          if [[ "${WINDOWS_NIGHTLY_6_0_ENABLED}" == "true" ]]; then
+              windows_nightly_matrix=$(echo "$windows_nightly_matrix" | jq '.swift[.swift| length] |= . + { "image": "swiftlang/swift:nightly-6.0-windowsservercore-1809", "swift_version": "nightly-6.0" }')
+          elif [[ "${WINDOWS_NIGHTLY_MAIN_ENABLED}" == "true" ]]; then
+              windows_nightly_matrix=$(echo "$windows_nightly_matrix" | jq '.swift[.swift| length] |= . + { "image": "swiftlang/swift:nightly-main-windowsservercore-1809", "swift_version": "nightly-main" }')
+          fi
+
+          {
+            echo 'windows-nightly-matrix<<EOF'
+            echo $windows_nightly_matrix
+            echo EOF
+          } >> "$GITHUB_OUTPUT"
+
+          echo "$GITHUB_OUTPUT"
+      - run: |
+          echo "${{ steps.set-matrix.outputs.linux-matrix }}"
+          echo "${{ steps.set-matrix.outputs.windows-matrix }}"
+          echo "${{ steps.set-matrix.outputs.windows-nightly-matrix }}"
+
   windows:
     name: Windows (${{ matrix.swift.swift_version }})
+    needs: generate-matrix
     runs-on: windows-2022
     strategy:
       fail-fast: false
-      matrix:
-        # We are specifying only the major and minor of the docker images to automatically pick up the latest patch release
-        swift:
-          - image: swift:6.0-windowsservercore-ltsc2022
-            swift_version: "6.0"
-            enabled: ${{ inputs.matrix_windows_6_0_enabled }}
+      matrix: ${{fromJson(needs.generate-matrix.outputs.windows-matrix)}}
     steps:
       - name: Pull Docker image
-        if: ${{ matrix.swift.enabled }}
         run: docker pull ${{ matrix.swift.image }}
       - name: Checkout repository
-        if: ${{ matrix.swift.enabled }}
         uses: actions/checkout@v4
         with:
           persist-credentials: false
       - name: Donwload matrix script
-        if: ${{ matrix.swift.enabled }}
         run: curl -s https://raw.githubusercontent.com/apple/swift-nio/main/scripts/check-matrix-job.ps1 -o __check-matrix-job.ps1
       - name: Run matrix job
-        if: ${{ matrix.swift.enabled }}
         run: |
           docker run --env SWIFT_VERSION="${{ matrix.swift.swift_version }}" --env COMMAND="${{ inputs.matrix_windows_command }}" --env COMMAND_OVERRIDE_6_0="${{ inputs.matrix_windows_6_0_command_override }}" -v ${{ github.workspace }}:C:\source ${{ matrix.swift.image }} cmd /s /c  "swift --version & cd C:\source\ & powershell -File __check-matrix-job.ps1"
 

.github/workflows/unit_tests.yml

@@ -73,7 +73,7 @@ jobs:
   unit-tests:
     name: Unit tests
     # Workaround https://github.com/nektos/act/issues/1875
-    uses: apple/swift-nio/.github/workflows/swift_matrix.yml@main
+    uses: ./.github/workflows/swift_matrix.yml
     with:
       name: "Unit tests"
       matrix_linux_command: "swift test"