add docker and docker-compose files (#15)

Dockerfile

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+FROM golang:1.22.0-alpine as builder
+RUN apk --update add ca-certificates
+RUN cd ..
+RUN mkdir lite-reader
+WORKDIR lite-reader
+COPY . ./
+ENV GO111MODULE=on
+RUN CGO_ENABLED=0 GOOS=linux go build -mod=vendor -a -installsuffix cgo -o lite-reader ./cmd/main.go
+
+FROM scratch
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+COPY --from=builder /go/lite-reader/public ./public
+COPY --from=builder /go/lite-reader/lite-reader .
+
+# Directory to store the data, which can be referenced as the mounting point.
+VOLUME /var/opt/lite-reader
+EXPOSE 3000
+
+ENTRYPOINT ["./lite-reader"]

docker-compose.yaml

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+version: '3.7'
+services:
+  lite-reader:
+    build:
+      context: .
+      dockerfile: ./Dockerfile
+    environment:
+      DB_PATH: /var/opt/lite-reader/agg.db
+    ports:
+      - "8080:3000"
+    volumes:
+        - ./data:/var/opt/lite-reader