Base Docker scratch image as static file storage

Makefile

.DEFAULT_GOAL := app
.ONESHELL:
.PHONEY: app clean
EXECUTOR := $(shell which docker || which podman)


%: %.image
	$(EXECUTOR) run --rm vendor/$*
	$(EXECUTOR) history vendor/$*
	@$(MAKE) clean

%.image: Dockerfile.%
	$(EXECUTOR) build --no-cache -t vendor/$* -f Dockerfile.$* .

Dockerfile.app: donor.image
	@echo 'FROM alpine:3.21' > $@
	@echo 'COPY --from=vendor/donor /out/data/*.txt /usr/data/' >> $@
	@echo 'ENTRYPOINT ["sh", "-lc", "cat /usr/data/*.txt"]' >> $@

Dockerfile.donor: first.txt second.txt
	@echo "FROM scratch" > $@
	@echo "COPY ./*.txt /out/data/" >> $@

%.txt:
	@echo "$* file data" > $@

clean:
	@$(EXECUTOR) rmi -f vendor/app vendor/donor > /dev/null 2>&1 || true
	@rm *.txt Dockerfile.*