fix: copy .git information for dev builds

Signed-off-by: Roman Gershman <roman@dragonflydb.io>

Author: romange

tools/packaging/Dockerfile.ubuntu-dev

@@ -5,6 +5,8 @@ WORKDIR /build
 
 COPY ./Makefile ./CMakeLists.txt ./
 COPY src ./src
+
+COPY .git/ ./.git/
 COPY cmake ./cmake
 COPY helio ./helio