cleanup file structure, dockerize app

Dockerfile

@@ -0,0 +1,34 @@
+# syntax=docker/dockerfile:1
+
+FROM golang:1.25-alpine AS builder
+
+WORKDIR /src
+
+RUN apk add --no-cache ca-certificates git
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+
+ARG APP_VERSION=dev
+RUN CGO_ENABLED=0 GOOS=linux go build \
+	-ldflags="-s -w -X main.appName=go-http-server -X main.appVersion=${APP_VERSION}" \
+	-o /out/server \
+	./cmd/app
+
+FROM alpine:3.20
+
+RUN apk add --no-cache ca-certificates wget
+
+WORKDIR /app
+
+RUN addgroup -S app && adduser -S app -G app
+
+COPY --from=builder /out/server /app/server
+
+USER app
+
+EXPOSE 3000
+
+ENTRYPOINT ["/app/server"]