fix #180

[MarcOrfilaCarreras]

What kind of change does this PR introduce? (check at least one)

• [ ] Bugfix
• [ ] Feature
• [ ] Code style update
• [ ] Refactor
• [x] Build-related changes
• [ ] Other, please describe:

The PR fulfills these requirements:

• [x] When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)

If adding a new feature, the PR's description includes:

• [ ] A convincing reason for adding this feature (it's best to open a suggestion issue first and wait for approval before working on it)

Other information:

Changed the Python image to use the slim version, also installing the gcc library for the arm64 architecture. I have tested the build process with this command:

docker buildx build --platform linux/amd64,linux/arm64 .

[cwilvx]

@MarcOrfilaCarreras

Thank you for the Docker image size fix. Appreciated.