tweaks to dockerfile for better layer caching

Author: sunu

Dockerfile

@@ -5,10 +5,12 @@ WORKDIR /app
 
 COPY pyproject.toml ./
 
-COPY stac_search/ ./stac_search/
+RUN mkdir -p stac_search
 
 RUN pip install --no-cache-dir .
 
+COPY stac_search/ ./stac_search/
+
 # Expose the port the app runs on
 EXPOSE 8000