Cannot run installed tool in Dockerfile even though its there

Question

I installed diesel-cli in a Dockerfile:

FROM alpine:latest
ENV PATH="/root/.cargo/bin:${PATH}"
RUN apk update
RUN apk add postgresql curl gcc musl-dev libpq-dev bash
RUN curl https://sh.rustup.rs -sSf | sh -s -- -y
WORKDIR /app

RUN cargo install diesel_cli --no-default-features --features postgres

COPY . .

EXPOSE 8000
CMD [ "docker/entrypoint.sh"]

That works fine. The entrypoint.sh is:

#!/bin/bash
export PATH="/root/.cargo/bin:${PATH}"

ls /root/.cargo/bin/diesel
bash -c "/root/.cargo/bin/diesel setup"

The strange this is that the ls shows that the diesel binary is there. But when running the docker container it still says:

bash: line 1: /root/.cargo/bin/diesel: No such file or directory

I also tried calling diesel right from the Dockerfile with the same result.

Why can't I run diesel this way?

Answer 1

See comment by The Fool!

Using a different base image resolves the problem:

FROM debian:bullseye-slim
ENV PATH="/root/.cargo/bin:${PATH}"
RUN apt update -y
RUN apt install postgresql curl gcc libpq-dev bash -y
RUN curl https://sh.rustup.rs -sSf | sh -s -- -y

WORKDIR /app

# This may take a minute
RUN cargo install diesel_cli --no-default-features --features postgres

COPY . .
# provision the database
EXPOSE 8000
CMD [ "docker/entrypoint.sh"]