Download and build podman-compose using docker/podman locally

[iruzo]

Reason for this PR

As a user of Fedora Silverblue I found that the easiest ways to install podman-compose are:

• Open a toolbox/distrobox container, install there the python dependencies, use pyinstaller, generate a podman-compose binary and move it outside of the container to use it.
• Create a virtual env, install dependencies and use pyinstaller to compile it.
• Install Podman Desktop and let it install and manage podman-compose.
• [Not actually podman-compose] Manually set podman.socket and downloading docker-compose.

I just wanted to execute a single command and obtain a binary I can save on my home directory without modifying anything outside my $HOME.

Changes

• Adds Dockerfile that compiles podman-compose and let the binary on /result.
• Adds a script to generate the binary and drop it on the current directory.
• Adds script to simplify this process so people can just "download" the binary by executing a single shell command.

Usage

sh -c "$(curl -sSL https://github.com/raw/containers/podman-compose/main/scripts/download_podman-compose.sh)"

Using this approach, everything happens within the build steps of the Dockerfile, so no dependencies or temporary files should be left on your system.

Thanks in advance. Any suggestions are welcome.

[p12tic]

Thanks for the PR. It will take some time to review it. Ideally I would like to have this as part of release process so that the executables are added to release artifacts.