Added checks for linters and database migrations

Closes https://git.gfz-potsdam.de/dynamicexposure/collaboration/-/issues/405

\approve @marius; \fyi @cnievas

.gitlab-ci.yml

-image: debian:bullseye-slim
+image: debian:bookworm-slim
 
 before_script:
   - apt update -y
   - apt install -y git make shellcheck golang-go postgresql -y -qq
   - export GOPATH="$HOME/go"
   - export PATH="$PATH:$GOPATH/bin"
-  - go get -u github.com/mvdan/sh/cmd/shfmt
+  - go get -u mvdan.cc/sh/v3/cmd/shfmt
 
 linters:
   script: