Added docker on backend

backend/Dockerfile

@@ -0,0 +1,13 @@
+FROM golang:1.25.3 AS build
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+RUN GOOS=linux GOARCH=amd64 go build -pgo=auto -ldflags="-s -w" -o bin/esign-server main.go
+
+FROM alpine:latest
+WORKDIR /app
+COPY --from=build /app/bin/esign-server .
+EXPOSE 4320
+CMD ["./esign-server"]

backend/docker-compose.yml

@@ -0,0 +1,9 @@
+services:
+  e-sign-server:
+    container_name: e-sign-server
+    restart: unless-stopped
+    build:
+      context: .
+      dockerfile: Dockerfile
+    ports:
+      - 4320:4320