Added Dockerfile and build script

Dockerfile

@@ -0,0 +1,10 @@
+FROM i386/alpine
+
+RUN apk update
+RUN apk add --no-cache build-base libpng-dev wine ncurses freetype
+RUN apk add binutils-arm-none-eabi --no-cache --repository http://dl-3.alpinelinux.org/alpine/edge/testing/ --allow-untrusted
+
+ENV BUSYBOX 1
+WORKDIR /app
+
+CMD ["/bin/sh"]

arm9/Makefile

@@ -192,7 +192,11 @@ LDFLAGS = -nodead -w off -proc v5te -interworking -map closure,unused -symtab so
 ####################### Other Tools #########################
 
 # DS TOOLS
+ifndef BUSYBOX
 SHA1SUM = sha1sum --quiet
+else
+SHA1SUM = sha1sum
+endif
 JSONPROC = $(TOOLS_DIR)/jsonproc/jsonproc$(EXE)
 GFX = $(TOOLS_DIR)/nitrogfx/nitrogfx$(EXE)
 SCANINC = $(TOOLS_DIR)/scaninc/scaninc$(EXE)

build_docker.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+ver="0.1"
+
+docker inspect pokediamond:$ver > /dev/null
+if [ $? = 0 ];  then
+    echo "Not rebuilding image since image exists";
+else
+    docker build -t pokediamond:$ver .
+fi
+docker run --network=none -it -v $(pwd):/app pokediamond:$ver