Update Dockerfile

Dockerfile

@@ -12,7 +12,6 @@ RUN apt-get update && apt-get install -y \
 WORKDIR /app
 
 # Step 4: Download and extract Stockfish 18 safely
-# This extracts it into a dedicated folder and skips the broken renaming command completely
 RUN mkdir -p engines && \
     wget https://github.com/official-stockfish/Stockfish/releases/download/sf_18/stockfish-ubuntu-x86-64-avx2.tar && \
     tar -xf stockfish-ubuntu-x86-64-avx2.tar -C engines && \
@@ -21,6 +20,10 @@ RUN mkdir -p engines && \
 # Step 5: Copy all your repository files into the container
 COPY . /app
 
+# Step 5.5: Fix permissions for the fairy stockfish engine
+# This ensures Linux allows the bot to execute the binary
+RUN chmod +x /app/fairy/stockfish
+
 # Step 6: Install the Python requirements
 RUN pip install --no-cache-dir -r requirements.txt