[Tile-serving] [openstreetmap/osm2pgsql] Dockerfile for osm2pgsql (#1428)

[ImreSamu]

> the image size is very large (unoptimized ~1,4 GB with debian-slim-buster).  

my2c:   
* IF the latest `osm2pgsql` release ( `1.4.1` ) is ok ..  
     * THEN  -->  my proposal the `debian:bullseye` packaged version!  
* I am using the `bullseye` everywhere ..  it is ~stable and contains the latest releases from osmium / osm2pgsql / ... 


simple example:

Now:
* 2021-03-13 14:53:02  osm2pgsql version 1.4.1 
* size:  123MB
```
$ docker images | grep osm2pgsql
osm2pgsql                              bullseye          3f3d972b5a11   37 seconds ago   123MB
```

### Dockerfile
```
ARG BASE_IMAGE=debian
ARG BASE_TAG=bullseye-slim
FROM ${BASE_IMAGE}:${BASE_TAG}

ENV DEBIAN_FRONTEND noninteractive
ENV LANG en_US.UTF-8

RUN apt-get update \
  && apt-get install -y --no-install-recommends \
    osm2pgsql \
  && apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/*

RUN osm2pgsql --help
```

build: `docker build -t osm2pgsql:bullseye .`



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