Dockerfile and some add/fix config

Dockerfile

@@ -0,0 +1,35 @@
+# Stage 1: Build the Go application
+FROM golang:1.25-alpine AS builder
+
+WORKDIR /app
+
+# Copy go.mod and go.sum first to leverage Docker cache
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy the rest of the application source code
+COPY . .
+
+# Build the Go application
+# CGO_ENABLED=0 disables CGO, creating a statically linked binary
+# -o /app/main specifies the output path and name of the executable
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o /app/main .
+
+# Stage 2: Create a minimal runtime image
+FROM alpine:latest
+
+# Install ca-certificates for HTTPS support if needed
+RUN apk --no-cache add ca-certificates
+
+WORKDIR /root/
+
+# Copy the built executable from the builder stage
+COPY --from=builder /app/main .
+
+# Expose the port your application listens on (e.g., 2222)
+EXPOSE 2222
+ENV PORT=2222
+ENV ROOT_PATH="/app/data"
+
+# Command to run the application when the container starts
+CMD ["./main"]