Add docker file for testing builds

docker/Dockerfile

@@ -0,0 +1,31 @@
+FROM docker.io/library/debian:11 as base
+
+RUN apt-get -qq update -y
+
+RUN DEBIAN_FRONTEND=noninteractive \
+       apt-get install -y --no-install-recommends \
+            build-essential \
+            libusb-1.0.0-dev \
+            git \
+            sdcc \
+            ca-certificates
+
+# Cleanup cached apt stuff
+RUN rm -rf /var/lib/apt/lists/*
+
+FROM base as toolsbuilder
+
+# Tools that needs to be built from source
+
+RUN git clone https://github.com/ole00/chprog.git /src
+WORKDIR /src
+RUN ./build_linux.sh
+RUN cp ./chprog /usr/local/bin
+
+From base
+COPY --from=toolsbuilder /usr/local/ /usr/local
+
+RUN apt-get -qq update -y
+
+# Needed for git --describe to work
+RUN git config --global --add safe.directory /build

docker/Makefile

@@ -0,0 +1,26 @@
+all:
+	@echo "Build targets: "
+	@echo "build-docker		Build an image for building tools with Docker"
+	@echo "build			Build project assets from within Docker container"
+	@echo "run			    Run a shell using the above image with Docker"
+
+IMAGE_NAME=ch554_sdcc
+
+
+COMMON = run \
+		--rm \
+		--mount type=bind,source="`pwd`/..",target=/build \
+		-w /build \
+
+build-docker:
+	docker build -t ${IMAGE_NAME} -f Dockerfile .
+
+build:
+	docker ${COMMON} \
+		-it ${IMAGE_NAME} \
+		/bin/bash -c "cd examples; make clean; make"
+
+run:
+	docker ${COMMON} \
+		-it ${IMAGE_NAME} \
+		/bin/bash

examples/Makefile

@@ -1,13 +1,18 @@
 SUBDIRS = $(shell ls -d */)
 
-.PHONY: $(SUBDIRS)
-
+.PHONY: $(SUBDIRS) clean
 
 $(SUBDIRS):
 	$(MAKE) -C $@
 
 .DEFAULT_GOAL := all
 all: $(SUBDIRS)
 
+clean:
+	@for dir in $(SUBDIRS); do \
+		$(MAKE) -C $$dir clean; \
+	done
 
 print-%  : ; @echo $* = $($*)
+
+