我试图为我的盖茨比应用程序构建Docker映像。每当我运行命令docker构建。-t gatsbyapp，它会给出一个错误:

failed to solve with frontend dockerfile.v0: failed to build LLB:
failed to compute cache key: "/.env" not found: not found

同时我的Dockerfile如下所示:

FROM node:13

WORKDIR /app

COPY package.json .

RUN yarn global add gatsby-cli

RUN yarn install

COPY gatsby-config.js .

COPY .env .

EXPOSE 8000

CMD ["gatsby","develop","-H","0.0.0.0"]