Docker build is using cache for COPY command even if my files have changed

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I have a Dockerfile that is as follow:

FROM node:14-alpine as frontend-builder
WORKDIR /app/frontend
COPY ./frontend .
ENV PATH ./node_modules/.bin/:$PATH
RUN set -ex; \
  yarn install --frozen-lockfile --production; \
  yarn cache clean; \
  yarn run build
CMD ["tail", "-f", "/dev/null"]

I have changed one file in frontend folder and re-run the build and docker is using the cache...I know i can force to build with --no-cache but how can i tweak docker so it detects changes in my files instead of no-cache option ?

docker
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