feat: add path_to_claude_code_executable input for custom Claude Code… (#480)

* feat: add path_to_claude_code_executable input for custom Claude Code installations

Adds optional input to specify a custom Claude Code executable path, bypassing automatic installation. This enables:
- Using pre-installed Claude Code binaries
- Testing with specific versions for debugging
- Custom installation paths in unique environments

Includes warning that older versions may cause compatibility issues with new features.

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

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

* test: add workflow to test custom Claude Code executable path

Adds test workflow that:
- Manually installs Claude Code via install script
- Uses the new path_to_claude_code_executable input
- Verifies the custom executable path works correctly
- Validates output and execution success

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

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

---------

Co-authored-by: Claude <noreply@anthropic.com>

.github/workflows/test-custom-executable.yml

@@ -0,0 +1,84 @@
+name: Test Custom Claude Code Executable
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  test-custom-executable:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+
+      - name: Install Claude Code manually
+        run: |
+          echo "Installing Claude Code using install script..."
+          curl -fsSL https://claude.ai/install.sh | bash -s latest
+          echo "Claude Code installed at: $HOME/.local/bin/claude"
+
+          # Verify installation
+          if [ -f "$HOME/.local/bin/claude" ]; then
+            echo "✅ Claude executable found"
+            ls -la "$HOME/.local/bin/claude"
+          else
+            echo "❌ Claude executable not found"
+            exit 1
+          fi
+
+      - name: Test with custom executable path
+        id: custom-exe-test
+        uses: ./base-action
+        with:
+          prompt: |
+            List the files in the current directory starting with "package"
+          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
+          path_to_claude_code_executable: /home/runner/.local/bin/claude
+          allowed_tools: "LS,Read"
+          timeout_minutes: "3"
+
+      - name: Verify custom executable output
+        run: |
+          OUTPUT_FILE="${{ steps.custom-exe-test.outputs.execution_file }}"
+          CONCLUSION="${{ steps.custom-exe-test.outputs.conclusion }}"
+
+          echo "Conclusion: $CONCLUSION"
+          echo "Output file: $OUTPUT_FILE"
+
+          if [ "$CONCLUSION" = "success" ]; then
+            echo "✅ Action completed successfully with custom executable"
+          else
+            echo "❌ Action failed with custom executable"
+            exit 1
+          fi
+
+          if [ -f "$OUTPUT_FILE" ]; then
+            if [ -s "$OUTPUT_FILE" ]; then
+              echo "✅ Execution log file created successfully with content"
+              echo "Validating JSON format:"
+              if jq . "$OUTPUT_FILE" > /dev/null 2>&1; then
+                echo "✅ Output is valid JSON"
+                echo "Content preview:"
+                head -c 500 "$OUTPUT_FILE"
+                echo ""
+                
+                # Verify the task was completed
+                if grep -q "package" "$OUTPUT_FILE"; then
+                  echo "✅ Claude successfully listed package files"
+                else
+                  echo "⚠️ Could not verify if package files were listed"
+                fi
+              else
+                echo "❌ Output is not valid JSON"
+                exit 1
+              fi
+            else
+              echo "❌ Execution log file is empty"
+              exit 1
+            fi
+          else
+            echo "❌ Execution log file not found"
+            exit 1
+          fi