Enhance Docker image with rv32emu-user, rv32emu-system, and rv32emu-histogram

Include three executables in the Docker image:
- rv32emu-user: for user-mode emulation
- rv32emu-system: for system-mode emulation
- rv32emu-histogram: for statistical analysis

This enhancement enables the Docker image to support both user-mode
and system-mode emulation.

Close #581

Author: kaiii708

Dockerfile

@@ -1,14 +1,18 @@
 FROM alpine:3.21 AS base_gcc
 
-RUN apk add --update alpine-sdk git wget sdl2-dev sdl2_mixer-dev
+RUN apk add --update alpine-sdk git wget sdl2-dev sdl2_mixer-dev dtc
 
 # copy in the source code
 WORKDIR /home/root/rv32emu
 COPY . .
 
 # generate execution file for rv32emu and rv_histogram
-RUN make
-RUN make tool
+RUN make -j"$(nproc)"
+RUN make tool -j"$(nproc)"
+RUN mv ./build/rv32emu ./build/rv32emu-user
+RUN mv ./build/rv_histogram ./build/rv32emu-histogram
+RUN make distclean
+RUN make ENABLE_SYSTEM=1 INITRD_SIZE=32 -j"$(nproc)"
 
 FROM alpine:3.21 AS final
 
@@ -18,8 +22,9 @@ COPY ./build/*.elf /home/root/rv32emu/build/
 # get rv32emu and rv_histogram binaries and lib of SDL2 and SDL2_mixer
 COPY --from=base_gcc /usr/include/SDL2/ /usr/include/SDL2/
 COPY --from=base_gcc /usr/lib/libSDL2* /usr/lib/
-COPY --from=base_gcc /home/root/rv32emu/build/rv32emu /home/root/rv32emu/build/rv32emu
-COPY --from=base_gcc /home/root/rv32emu/build/rv_histogram /home/root/rv32emu/build/rv_histogram
+COPY --from=base_gcc /home/root/rv32emu/build/rv32emu-user /home/root/rv32emu/build/rv32emu-user
+COPY --from=base_gcc /home/root/rv32emu/build/rv32emu /home/root/rv32emu/build/rv32emu-system
+COPY --from=base_gcc /home/root/rv32emu/build/rv32emu-histogram /home/root/rv32emu/build/rv32emu-histogram
 
 ENV PATH=/home/root/rv32emu/build:$PATH