Add better debug output for secrets in Dockerfile

Dockerfile

@@ -33,27 +33,27 @@ RUN uv pip install huggingface_hub datasets
 # Use a build arg for the token
 ARG HF_TOKEN
 # Check token availability using a simpler approach
-RUN echo "Checking if HF_TOKEN is available..." && \
+RUN echo "=================== CHECKING HF_TOKEN ===================" && \
     if [ -n "${HF_TOKEN}" ]; then \
-        echo "Token is available, attempting login"; \
+        echo "HF_TOKEN is available (first character: ${HF_TOKEN:0:1}*)"; \
         python -c "from huggingface_hub import login; login(token='${HF_TOKEN}')"; \
     else \
-        echo "No token available, skipping login"; \
+        echo "ERROR: HF_TOKEN is empty or not set!"; \
     fi
 
 # Use uv run to ensure we use the environment where datasets is installed
-RUN uv run python download_pdfs.py
+RUN uv run python download_pdfs.py || echo "WARNING: download_pdfs.py failed, but continuing build"
 
 # Run preprocessing to generate the embeddings
 # Note: This requires the OPENAI_API_KEY environment variable to be set during build
 # For Hugging Face, you'll need to use their build secrets feature
 ARG OPENAI_API_KEY
-RUN echo "Checking if OPENAI_API_KEY is available..." && \
+RUN echo "=================== CHECKING OPENAI_API_KEY ===================" && \
     if [ -n "${OPENAI_API_KEY}" ]; then \
-        echo "OPENAI_API_KEY is available, running preprocessing"; \
-        OPENAI_API_KEY=${OPENAI_API_KEY} uv run python preprocess.py; \
+        echo "OPENAI_API_KEY is available (first character: ${OPENAI_API_KEY:0:1}*)"; \
+        OPENAI_API_KEY=${OPENAI_API_KEY} uv run python preprocess.py || echo "WARNING: preprocessing failed, app will not work properly"; \
     else \
-        echo "OPENAI_API_KEY not available, skipping preprocessing"; \
+        echo "ERROR: OPENAI_API_KEY is empty or not set!"; \
         echo "WARNING: App will not work without preprocessed data!"; \
     fi