Use setup-java outputs for JDK path configuration

Replace manual JDK path construction with official setup-java step
outputs. This eliminates brittle path patterns and OS-specific logic.

Changes:
- Add step IDs to all setup-java actions
- Use step outputs via env variables in .envrc creation
- Replace separate Unix/Windows steps with single unified step
- Remove architecture detection and RUNNER_TOOL_CACHE path patterns

Benefits:
- More reliable: Uses official actions/setup-java API
- Simpler: Reduced from ~60 lines to ~26 lines
- Platform-agnostic: Works on Linux, macOS, Windows automatically
- Maintainable: No hardcoded paths that break with tooling updates

Tested locally with 'act' tool.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Introduced in the course of support-and-care/maven-support-and-care#137

Author: ascheman

.github/workflows/build.yml

@@ -41,20 +41,23 @@ jobs:
       run: cd jigsaw-examples && shellcheck -ax all*.sh
 
     - name: Set up JDK 8 (non macOS)
+      id: setup-jdk8
       uses: actions/setup-java@v5
       if: runner.os != 'macOS'
       with:
         distribution: 'temurin'
         java-version: '8'
 
     - name: Set up JDK 8 (macOS)
+      id: setup-jdk8-mac
       uses: actions/setup-java@v5
       if: runner.os == 'macOS'
       with:
         distribution: 'zulu'
         java-version: '8'
 
     - name: Set up JDK 11
+      id: setup-jdk11
       uses: actions/setup-java@v5
       with:
         distribution: 'temurin'
@@ -63,67 +66,34 @@ jobs:
         # end::java-version-minimal[]
 
     - name: Set up JDK 17
+      id: setup-jdk17
       uses: actions/setup-java@v5
       with:
         distribution: 'temurin'
         java-version: '17'
 
-    - name: Create .envrc with Java paths (Unix)
-      if: runner.os != 'Windows'
-      run: |
-        arch="$(uname -m | sed -e 's/aarch/arm/g' -e 's/x86_/x/g')"
-        if test "$(uname)" = "Darwin"; then
-          JAVA11_HOME="$(ls -d $RUNNER_TOOL_CACHE/Java_Temurin-Hotspot_jdk/11*/${arch}/Contents/Home)"
-          JAVA17_HOME="$(ls -d $RUNNER_TOOL_CACHE/Java_Temurin-Hotspot_jdk/17*/${arch}/Contents/Home)"
-          JAVA8_HOME="$(ls -d $RUNNER_TOOL_CACHE/Java_Zulu_jdk/8*/${arch})"
-        else
-          JAVA11_HOME="$(ls -d $RUNNER_TOOL_CACHE/Java_Temurin-Hotspot_jdk/11*/${arch})"
-          JAVA17_HOME="$(ls -d $RUNNER_TOOL_CACHE/Java_Temurin-Hotspot_jdk/17*/${arch})"
-          JAVA8_HOME="$(ls -d $RUNNER_TOOL_CACHE/Java_Temurin-Hotspot_jdk/8*/${arch})"
-        fi
-        cat > .envrc << EOF
-        # Environment configuration for Java 9 Jigsaw Examples
-        # Auto-generated by GitHub Actions
-        
-        # Path to JDK 17 or later (required for example_gradle-project with Gradle 9.x)
-        export JAVA17_HOME=$JAVA17_HOME
-
-        # Path to JDK 11 (required for most examples, JDK 17 is also fine)
-        export JAVA_HOME=$JAVA11_HOME
-
-        # Path to JDK 8 (only needed for example_compile-target-jdk8)
-        export JAVA8_HOME=$JAVA8_HOME
-
-        # Add Java to PATH to ensure it is the first Java version found by any shell execution
-        export PATH="$JAVA_HOME/bin:$PATH"
-        EOF
-
-        echo "=== Created .envrc file ==="
-        cat .envrc
-
-    - name: Create .envrc with Java paths (Windows)
-      if: runner.os == 'Windows'
+    - name: Create .envrc with Java paths
       shell: bash
+      env:
+        JAVA8_PATH: ${{ steps.setup-jdk8.outputs.path || steps.setup-jdk8-mac.outputs.path }}
+        JAVA11_PATH: ${{ steps.setup-jdk11.outputs.path }}
+        JAVA17_PATH: ${{ steps.setup-jdk17.outputs.path }}
       run: |
-        arch="x64"
-        JAVA8_HOME="$(cygpath -u "$(ls -d /c/hostedtoolcache/windows/Java_Temurin-Hotspot_jdk/8*/${arch})")"
-        JAVA11_HOME="$(cygpath -u "$(ls -d /c/hostedtoolcache/windows/Java_Temurin-Hotspot_jdk/11*/${arch})")"
-        JAVA17_HOME="$(cygpath -u "$(ls -d /c/hostedtoolcache/windows/Java_Temurin-Hotspot_jdk/17*/${arch})")"
         cat > .envrc << EOF
         # Environment configuration for Java 9 Jigsaw Examples
         # Auto-generated by GitHub Actions
 
         # Path to JDK 17 or later (required for example_gradle-project with Gradle 9.x)
-        export JAVA17_HOME=$JAVA17_HOME
+        export JAVA17_HOME=$JAVA17_PATH
 
         # Path to JDK 11 (required for most examples, JDK 17 is also fine)
-        export JAVA_HOME=$JAVA11_HOME
+        export JAVA_HOME=$JAVA11_PATH
 
         # Path to JDK 8 (only needed for example_compile-target-jdk8)
-        export JAVA8_HOME=$JAVA8_HOME
+        export JAVA8_HOME=$JAVA8_PATH
 
         # Add Java to PATH to ensure it is the first Java version found by any shell execution
-        export PATH="$JAVA_HOME/bin:$PATH"
+        export PATH="\$JAVA_HOME/bin:\$PATH"
         EOF
 
         echo "=== Created .envrc file ==="