[Django]-Pillow is not found by Django thouhg it is installed using docker

Please try to use "pillow" starting from lowercase p.

Add this two lines under the FINAL section, just below the RUN apk update && apk add libpq

# install pillow dependencies
RUN apk add --no-cache jpeg-dev zlib-dev
RUN apk add --no-cache --virtual .build-deps build-base linux-headers

This is happening because the BUILDER removes the dependencies required for Pillow after creating the image. In the FINAL image, Pillow is available, but its required dependencies are not.

I was stuck with the same problem.
Adding these dependencies to the FINAL section resolved this issue

# install pillow dependencies
RUN apk add --no-cache jpeg-dev zlib-dev \
    fribidi-dev \
    harfbuzz-dev \
    lcms2-dev \
    openjpeg-dev \
    tcl-dev \
    tiff-dev \
    tk-dev