fix: remove non-existent cmake/ COPY from Dockerfile.build

The cmake/ directory does not exist in the project, causing the Docker
build to fail. Remove the COPY directive since it is not needed.

packaging/Dockerfile.build

@@ -38,7 +38,6 @@ RUN if [ ! -f /etc/smartbotic-db-build-base ]; then \
 WORKDIR /build
 
 COPY CMakeLists.txt VERSION ./
-COPY cmake/ ./cmake/
 COPY proto/ ./proto/
 COPY client/ ./client/
 COPY service/ ./service/