mbv: use new ninja-based build

mbv/Dockerfile

@@ -2,10 +2,13 @@ ARG TARGET
 
 FROM debian:bookworm AS deps
 
+# possible values: x64, arm64
+ARG ARCH=x64
+
 RUN DEBIAN_FRONTEND=noninteractive apt-get update && \
-    apt-get install -y make clang libgmock-dev gdb curl && \
+    apt-get install -y make clang libgmock-dev gdb curl ninja-build && \
     apt-get clean && rm -rf /var/lib/apt/lists
-RUN cd /opt && curl -L https://github.com/xpack-dev-tools/riscv-none-elf-gcc-xpack/releases/download/v14.2.0-3/xpack-riscv-none-elf-gcc-14.2.0-3-linux-x64.tar.gz | tar -xz
+RUN cd /opt && curl -L https://github.com/xpack-dev-tools/riscv-none-elf-gcc-xpack/releases/download/v14.2.0-3/xpack-riscv-none-elf-gcc-14.2.0-3-linux-${ARCH}.tar.gz | tar -xz
 
 
 FROM deps AS dev
@@ -17,10 +20,10 @@ ARG TARGET=${TARGET}
 ADD . /workspace
 WORKDIR /workspace
 
-RUN make ${TARGET}
+RUN ./configure --version=${VERSION} && ninja -C build ../out/${TARGET}
 
 
 FROM scratch AS export
 ARG TARGET=${TARGET}
 
-COPY --from=build /workspace/${TARGET} /
+COPY --from=build /workspace/out/${TARGET} /