Refactor Dockerfile to source nvm.sh using dot operator and update environment variables

Author: cbluebird

Language/node.js/22/Dockerfile

@@ -11,7 +11,8 @@ RUN apt-get update && \
     export NVM_DIR="/usr/local/nvm" && \
     mkdir -p $NVM_DIR && \
     cp -r /root/.nvm/* $NVM_DIR/ && \
-    echo 'export NVM_DIR="$NVM_DIR"' >> "/root/.bashrc" && \  
+    [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh" && \  
+    echo 'export NVM_DIR="$NVM_DIR"' >> "/root/.bashrc" && \
     echo '[ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"' >> "/root/.bashrc" && \
     echo '[ -s "$NVM_DIR/bash_completion" ] && . "$NVM_DIR/bash_completion" ' >> "/root/.bashrc" && \
     echo 'export NVM_DIR="$NVM_DIR"' >> "/home/devbox/.bashrc" && \