Add Docker image

Dockerfile

@@ -0,0 +1,11 @@
+FROM golang:1.16 as builder
+WORKDIR /src/litestream
+COPY . .
+RUN --mount=type=cache,target=/root/.cache/go-build \
+	--mount=type=cache,target=/go/pkg \
+	go build -ldflags '-w -extldflags "-static"' -o /usr/local/bin/litestream ./cmd/litestream
+
+FROM alpine
+COPY --from=builder /usr/local/bin/litestream /usr/local/bin/litestream
+ENTRYPOINT ["/usr/local/bin/litestream"]
+CMD []

Makefile

@@ -1,5 +1,8 @@
 default:
 
+docker:
+	docker build -t litestream .
+
 dist-linux:
 	mkdir -p dist
 	cp etc/litestream.yml dist/litestream.yml