feat: add fuzzer build check before reproduction

Build the fuzzer target before attempting to reproduce the crash
to ensure it compiles. This catches compilation errors early and
saves time by not attempting reproduction if the code doesn't build.

Signed-off-by: Joe Isaacs <[email protected]>

Author: joseph-isaacs

.github/workflows/fuzzer-fix-automation.yml

@@ -156,6 +156,25 @@ jobs:
           echo "✅ Downloaded crash file: $CRASH_FILE_PATH"
           echo "crash_file_path=$CRASH_FILE_PATH" >> $GITHUB_OUTPUT
 
+      - name: Build fuzzer target
+        id: build
+        run: |
+          echo "Building fuzzer target: ${{ steps.extract.outputs.target }}"
+
+          # Build the fuzzer target to ensure it compiles
+          if cargo +nightly fuzz build --sanitizer=none "${{ steps.extract.outputs.target }}" 2>&1 | tee fuzzer_build.log; then
+            echo "✅ Fuzzer target built successfully"
+            echo "build_success=true" >> $GITHUB_OUTPUT
+          else
+            echo "❌ Fuzzer target failed to build"
+            echo "build_success=false" >> $GITHUB_OUTPUT
+
+            # Show the build errors
+            echo "Build errors:"
+            tail -50 fuzzer_build.log
+            exit 1
+          fi
+
       - name: Reproduce crash
         id: reproduce
         continue-on-error: true