add reusable-jdk-os-matrix.yml

.github/workflows/reusable-jdk-os-matrix.yml

diff --git a/.github/workflows/reusable-jdk-os-matrix.yml b/.github/workflows/reusable-jdk-os-matrix.yml
new file mode 100644
index 0000000..05be7b9
--- /dev/null
+++ b/.github/workflows/reusable-jdk-os-matrix.yml
@@ -0,0 +1,89 @@
+name: Reusable JDK OS Matrix Logic
+
+on:
+  workflow_call:
+    inputs:
+      jdk_version:
+        required: true
+        type: string
+      os_type:
+        required: true
+        type: string
+      java_arch:
+        required: true
+        type: string
+
+env:
+  MAVEN_OPTS: -Xmx4g -Xms1g
+  MAVEN_ARGS: "-B -Dmaven.javadoc.skip=true -Dgpg.skip=true"
+
+jobs:
+  build:
+    name: Build (${{ inputs.os_type }}, JDK ${{ inputs.jdk_version }}, ${{ inputs.java_arch }})
+    runs-on: ${{ inputs.os_type }}
+    steps:
+      - name: Checkout Source code
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Checkout Workflow Logic (workflows branch)
+        uses: actions/checkout@v4
+        with:
+          ref: workflows
+          path: .github/workflow-logic
+
+      - name: Install Matrix JDK
+        uses: actions/setup-java@v4
+        with:
+          java-version: ${{ inputs.jdk_version }}
+          distribution: 'temurin'
+          java-package: jdk
+          architecture: ${{ inputs.java_arch }}
+          cache: 'maven'
+          overwrite-settings: true
+
+      - name: Verify Toolchain Configuration
+        shell: bash
+        run: |
+          if [ -f ~/.m2/toolchains.xml ]; then
+            cat ~/.m2/toolchains.xml
+          else
+            echo "toolchains.xml not found in ~/.m2/"
+          fi
+
+      - name: Echo Java & Maven Version
+        run: mvn -version
+
+      - name: Print Current Workflows
+        continue-on-error: true
+        run: |
+          echo "Checking for workflow files..."
+          echo "--- Reusable Workflow: ---"
+          cat .github/workflow-logic/.github/workflows/reusable-jdk-os-matrix.yml || echo "::warning::Could not find Reusable Workflow file."
+          echo "--- Caller Workflow: ---"
+          cat .github/workflows/auto-jdk-os-matrix.yml || echo "::warning::Could not find Caller Workflow file."
+
+      - name: Test
+        run: mvn clean test
+
+      - name: Install
+        run: mvn clean install "-DskipTests=true" "-Dmaven.clean.failOnError=false"
+
+      - name: Add Result to Summary
+        if: always()
+        shell: bash
+        run: |
+          # Define the header
+          HEADER="| OS | Arch | JDK | Status |"
+          SEP="|----|------|-----|--------|"
+
+          # Check if the header already exists in the summary file
+          if ! grep -q "$HEADER" "$GITHUB_STEP_SUMMARY"; then
+            echo "$HEADER" >> $GITHUB_STEP_SUMMARY
+            echo "$SEP" >> $GITHUB_STEP_SUMMARY
+          fi
+
+          # Append the specific job row
+          echo "| ${{ inputs.os_type }} | ${{ inputs.java_arch }} | ${{ inputs.jdk_version }} | ${{ job.status == 'success' && '✅' || '❌' }} |" >> $GITHUB_STEP_SUMMARY
+