install.sh: Clean up temp files in install script

[jahands]

What is the purpose of this change?

The install script at rclone.org/install.sh leaves temp files behind, which increases docker image size

Was the change discussed in an issue or in the forum before?

https://forum.rclone.org/t/install-sh-leaves-temp-files-around-inflating-docker-image-size/42940

Checklist

• [ x] I have read the contribution guidelines.
• [ n/a] I have added tests for all changes in this PR if appropriate.
• [ n/a] I have added documentation for the changes if appropriate.
• [x ] All commit messages are in house style.
• [ x] I'm done, this Pull Request is ready for review :-)

Testing

Ran repro steps described in the forum thread:

Dockerfile:

FROM ubuntu:22.04
RUN apt-get update && apt-get install -y \
    curl zip \
    && rm -rf /var/lib/apt/lists/*
# This url contains the fix
RUN curl https://sh.uuid.rocks/install/rclone.sh | bash

docker build . -t rclone-example
dive rclone-example

With this change, we can see the temp files no longer inflate the docker image:

[ncw]

That looks great - thank you!

[kapitainsky]

@jahands

Have a look at this:

https://forum.rclone.org/t/rclone-v1-65-0-release/43100/17

I suspect it might have something to do with temp files cleanup change...

[jahands]

@kapitainsky odd! I will take a look this weekend

[jahands]

This was fixed here: 96f8b7c