chore: add Dockerfile and basic CI test

Makefile

@@ -0,0 +1,24 @@
+NAME = dotkatapult
+BINARY = bin/${NAME}
+VERSION ?= $(shell cat VERSION)
+SOURCES = $(shell find . -name '*.go' -o -name 'Makefile')
+
+$(BINARY): $(SOURCES)
+	CGO_ENABLED=0 go build -a -o ${BINARY} -ldflags "-s -w"
+
+.PHONY: build
+build: $(BINARY)
+
+.PHONY: run
+run: $(BINARY)
+	$(BINARY)
+
+.PHONY: clean
+clean:
+	$(eval BIN_DIR := $(shell dirname ${BINARY}))
+	if [ -f ${BINARY} ]; then rm ${BINARY}; fi
+	if [ -d ${BIN_DIR} ]; then rmdir ${BIN_DIR}; fi
+
+.PHONY: docker
+docker:
+	docker build -t "$(shell whoami)/$(NAME)" .