Simplify osm-processor image and reduce size

[spwoodcock]

Issue

• The current osm-processor container on Dockerhub is very bloated at 4.56GB.
  • The dockerfile does not utilise multistage builds.
  • RUN stages are also not combined anywhere, adding additional unnecessary layers to the image.
• Builds osmosis from source:
  • Currently this fails due to an issue that has since been fixed in osmosis v0.49.0.
  • Has little advantage, as we are building v0.48.0, but the latest deb package on Debian bookworm is v0.48.3

Solution

• Swap to debian:bookworm-slim for small base image size.
• Simplifies dockerfile by installing all packages directly from Debian package repository.
• Combines install and cleanup into a single RUN stage to reduce number of image layers.

Resulting image size is 1.88GB and contains all the same binaries / libs.

[Rub21]

@spwoodcock this is great!! thank you for the improvements !!