Add Dockerfile

Dockerfile

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+FROM golang:alpine AS builder
+
+WORKDIR /src
+COPY . /src
+
+RUN go build -v -ldflags '-w -s -buildid=' -trimpath \
+    -o javtube-server cmd/server/main.go
+
+FROM alpine:latest
+LABEL org.opencontainers.image.source="https://github.com/javtube/javtube-sdk-go"
+
+COPY --from=builder /src/build/javtube-server /usr/bin/javtube-server
+
+RUN apk add --update --no-cache tzdata
+
+ENV GIN_MODE=release
+ENV PORT=8080
+ENV DSN=""
+ENV AUTOMIGRATE=true
+
+CMD ["javtube-server"]