Merge pull request #45685 from thaJeztah/24.0_backport_dockerfile_more_link

[24.0 backport] Dockerfile: use COPY --link for source code as well

Dockerfile

@@ -646,4 +646,4 @@ EOT
 # > make shell
 # > SYSTEMD=true make shell
 FROM dev-base AS dev
-COPY . .
+COPY --link . .