Added Docker setup for initial database import

This MR adds the import of an osm.pbf file into an empty database.

Related to https://git.gfz-potsdam.de/dynamicexposure/server-components/compositions/docker-openbuildingmap-import/-/merge_requests/2

\rfc @marius \approve @ds

.gitlab-ci.yml

+image: debian:bullseye-slim
+
+before_script:
+  - apt update -y
+  - apt install -y git make shellcheck golang-go
+  - export GOPATH="$HOME/go"
+  - export PATH="$PATH:$GOPATH/bin"
+  - go get -u github.com/mvdan/sh/cmd/shfmt
+
+linters:
+  script:
+    - make check