Fix linux debug symbols not showing (#2584)

#### Reference Issues/PRs
<!--Example: Fixes #1234. See also #3456.-->

#### What does this implement or fix?
#2335 since this no debug
symbols are being uploaded in releases or in any builds as they stopped
appearing in the artefacts

They are now showing
https://github.com/man-group/ArcticDB/actions/runs/16986080679?pr=2584
scroll down to build-metadata-linux artefacts
#### Any other comments?

#### Checklist

<details>
  <summary>
   Checklist for code changes...
  </summary>
 
- [ ] Have you updated the relevant docstrings, documentation and
copyright notice?
- [ ] Is this contribution tested against [all ArcticDB's
features](../docs/mkdocs/docs/technical/contributing.md)?
- [ ] Do all exceptions introduced raise appropriate [error
messages](https://docs.arcticdb.io/error_messages/)?
 - [ ] Are API changes highlighted in the PR description?
- [ ] Is the PR labelled as enhancement or bug so it appears in
autogenerated release notes?
</details>

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Author: ognyanstoimenov

build_tooling/prep_cpp_build.sh

@@ -34,6 +34,7 @@ case `uname -a` in
     popd || return
     ;;
 *)
+    pushd $(realpath $(dirname $BASH_SOURCE))/../cpp
     if [[ -n "$ARCTICDB_BUILD_DIR" ]] ; then
         if [[ "$CIBUILDWHEEL" == "1" ]] ; then
             ARCTICDB_BUILD_DIR="/host$ARCTICDB_BUILD_DIR"
@@ -43,5 +44,6 @@ case `uname -a` in
         [[ ! -e out ]] || rm -rf out
         ln -s "$ARCTICDB_BUILD_DIR" out
     fi
+    popd || return
 esac