Update 'build/Dockerfile'

build/Dockerfile

@@ -5,6 +5,8 @@ ARG USER_UID=1000
 ARG NODE_VERSION='' # node version number like "12.22.1" or empty for the latest version
 ARG COMPOSER_VERSION='' # composer version number like "2.1" or empty for the latest version
 
+ENV NVM_DIR="/home/$USERNAME/.nvm"
+
 COPY start-container /usr/local/bin/start-container
 
 RUN export DEBIAN_FRONTEND=noninteractive \
@@ -30,8 +32,9 @@ USER $USERNAME
 RUN echo "install nvm and node" \
 	&& curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.3/install.sh | bash \
 	&& if [ -z "$NODE_VERSION" ]; then NODE_VERSION="node"; fi \
-	&& export NVM_DIR="$HOME/.nvm" \
-	&& [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh" \
-	&& nvm install $NODE_VERSION
+	&& echo "source $NVM_DIR/nvm.sh" > /home/$USERNAME/.bashrc \
+	&& source $NVM_DIR/nvm.sh \
+	&& nvm install $NODE_VERSION \
+	&& nvm alias default $NODE_VERSION \
 
 ENTRYPOINT ["start-container"]