Update Dockerfile

Dockerfile

@@ -1,4 +1,5 @@
 FROM rocker/r2u:latest
+
 WORKDIR /code
 
 # Install system dependencies + Python
@@ -14,7 +15,16 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 # Install huggingface_hub Python package
 RUN pip3 install huggingface_hub --break-system-packages
 
-# Install R packages
+# Tell reticulate which Python to use
+ENV RETICULATE_PYTHON=/usr/bin/python3
+
+# Heavy R packages (cached separately so they don't rebuild often)
+RUN install2.r --error --skipinstalled \
+    arrow \
+    xgboost \
+    recipes
+
+# Lighter R packages (this layer rebuilds if you add/remove packages)
 RUN install2.r --error --skipinstalled \
     shiny \
     shinydashboard \
@@ -28,17 +38,12 @@ RUN install2.r --error --skipinstalled \
     progressr \
     RCurl \
     curl \
-    recipes \
-    arrow \
     base64enc \
-    reticulate \
-    xgboost
+    reticulate
 
-# Copy app files
+# Copy app files (changes here won't trigger package reinstall)
 COPY . .
 
-# Expose port
 EXPOSE 7860
 
-# Run the app
 CMD ["R", "--quiet", "-e", "shiny::runApp(host='0.0.0.0', port=7860)"]