I created a Dockerfile to build my Angular application with Nx:

FROM node:alpine3.19 AS builder

WORKDIR /app

RUN apk update && apk add git

COPY .git .git

COPY yarn.lock package.json .npmrc ./

RUN yarn --ignore-scripts --frozen-lockfile

COPY . .

RUN if [ -d .git ]; then echo ".git directory exists"; else echo ".git directory does not exist"; fi

RUN yarn nx format:check

However, the command yarn nx format:check fails because the .git folder is not copied and does not exist. (the command is uses git diff under the hood)

To fix this, I added COPY .git .git to the Dockerfile, but then I got an error:

#10 [builder  4/11] COPY .git .git
#10 ERROR: failed to calculate checksum of ref 89226611-c9a1-4907-b9f1-63100dae5a7c::z0tocv9x9pdgswr96d0866cfu: "/.git": not found
------
 > [builder  4/11] COPY .git .git:
------
Dockerfile:7
--------------------
   5 |     RUN apk update && apk add git
   6 |
   7 | >>> COPY .git .git
   8 |
   9 |     COPY yarn.lock package.json .npmrc ./
--------------------
ERROR: failed to solve: failed to compute cache key: failed to calculate checksum of ref 89226611-c9a1-4907-b9f1-63100dae5a7c::z0tocv9x9pdgswr96d0866cfu: "/.git": not found

Why is this happening, and how can I solve it?