Is it possible to create a volume that is a file, not a directory?

I am trying to make a simple structured nginx instance with docker. Using this command below to create the container...

docker container create -v ./nginx.conf:/etc/nginx/conf.d/nginx.conf -v .:/app/ -p 80:80 docker.io/nginx

And this is the file structure of it...

- www
-------------- public
---------------------------- index.html
- nginx.conf

And this is the nginx.conf

server {
    server_name localhost;
    listen 80;
    
    root /app/www/public;

    index index.html index.htm;
    autoindex on;
}

However the index.html will not work when I go to the localhost.

When I change the docker command to this it does work however, but this will also mirror all of the files and folder from my file structure into the containers /etc/nginx/conf.d/ directory

docker container create -v .:/etc/nginx/conf.d/ -v .:/app/ -p 80:80 docker.io/nginx

I am looking for something that can take a Dockerfile, like the following as an input:

FROM --platform=linux/amd64 debian:latest
ENV DEBIAN_FRONTEND=noninteractive

RUN apt update && apt install -y curl unzip libsecret-1-0 jq
COPY entrypoint.sh .
ENTRYPOINT [ "/entrypoint.sh" ]

And produce a a multi-stage Dockerfile where the last stage is built from scratch, with the dependencies for the script in the ENTRYPOINT (or CMD) copied over, like this:

FROM --platform=linux/amd64 debian:latest as builder
ENV DEBIAN_FRONTEND=noninteractive

RUN apt update && apt install -y curl unzip libsecret-1-0 jq

FROM --platform=linux/amd64 scratch as app
SHELL ["/bin/bash"]

# the binaries executed in entrypoint.sh
COPY --from=builder /bin/bash /bin/bash
COPY --from=builder /usr/bin/curl /usr/bin/curl
COPY --from=builder /usr/bin/jq /usr/bin/jq
COPY --from=builder /usr/bin/sleep /usr/bin/sleep

# shared libraries of the binaries
COPY --from=builder /lib/x86_64-linux-gnu/libjq.so.1 /lib/x86_64-linux-gnu/libjq.so.1
COPY --from=builder /lib/x86_64-linux-gnu/libcurl.so.4 /lib/x86_64-linux-gnu/libcurl.so.4
COPY --from=builder /lib/x86_64-linux-gnu/libz.so.1 /lib/x86_64-linux-gnu/libz.so.1
# ...a bunch of other shared libs...

# entrypoint
COPY entrypoint.sh /entrypoint.sh

ENTRYPOINT [ "/entrypoint.sh" ]

I've had pretty decent success creating images like this manually (using ldd to find the dependencies) based on this blog. To my knowledge, there's nothing out there that automates producing an image built from scratch, specifically. If something like this doesn't exist, I'm willing to build it myself.

I just installed Immich and while all my other containers have just required me to add to them to existing yaml, Immich requires its own yaml. That's fine I guess, but for the library, I wanna host it on my NAS and so I made the volume in my main Docker-Compose.yaml, the Immich yaml was all like, "what you talking about Willis?" because in my Immich environment I tried to point to something created in my main yaml. I thought I could work around this by adding an empty volume declaration, but now I can't find my uploads 😂 any idea on the correct methodology/workaround?

How did your journey begin? I feel like Docker has been getting mentioned for aeons and I've only just started using it now.