squash! Dockerfile changes suggested by Claude and ChatGPT

don't copy the environment.yml

Author: rwest

Dockerfile

@@ -57,8 +57,7 @@ RUN git clone --single-branch --branch ${RMG_Py_Branch} --depth 1 https://github
     git clone --single-branch --branch ${RMG_Database_Branch} --depth 1 https://github.com/ReactionMechanismGenerator/RMG-database.git
 
 WORKDIR /rmg/RMG-Py
-# Copy environment.yml to ensure Docker cache invalidates if it changes
-COPY environment.yml .
+
 # build the conda environment
 RUN conda env create --file environment.yml
 # Remove conda package cache to reduce image size