chore: add Dockerfile and basic CI test

.github/workflows/ci.yml

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+---
+name: CI
+on: [push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-go@v2
+        with:
+          go-version: 1.18
+      - name: Install dependencies
+        run: go mod download
+      - name: Build binary
+        run: make
+      - name: Run and make request
+        run: |
+          ./bin/dotkatapult --port=8080 &
+          curl --silent --retry 10 --retry-delay 1 --retry-connrefused \
+              http://localhost:8080/

.gitignore

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+bin/*
+/dotkatapult

Dockerfile

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+FROM golang:1.18-alpine as builder
+
+RUN apk add --no-cache git make
+WORKDIR /app
+COPY . .
+RUN env CGO_ENABLED=0 go build -a -o dotkatapult -ldflags "-s -w"
+
+FROM scratch
+ENV PORT 8080
+EXPOSE 8080
+WORKDIR /
+COPY --from=builder /app/dotkatapult /
+CMD ["/dotkatapult"]

Makefile

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+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)" .