i don't get it

Dockerfile

@@ -1,17 +1,15 @@
 FROM node:18-bullseye-slim
 WORKDIR /app
-COPY package*.json ./
-ARG GIT_COMMIT
-ARG GIT_BRANCH
+
 RUN apt-get update
 RUN apt-get install -y git
 RUN rm -rf /var/lib/apt/lists/*
+
+COPY package*.json ./
 RUN npm install
-RUN echo $GIT_BRANCH
-ENV GIT_BRANCH=$GIT_BRANCH
-ENV GIT_COMMIT=$GIT_COMMIT
+
 RUN git clone -n https://github.com/wukko/cobalt.git --depth 1 && mv cobalt/.git ./ && rm -rf cobalt
+
 COPY . .
 EXPOSE 9000
 CMD [ "node", "src/cobalt" ]
-