Add basic Dockerfile

Dockerfile

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+# Use Go 1.25.6 or newer
+FROM golang:1.25.6-alpine AS builder
+
+# Enable Go modules
+ENV GO111MODULE=on
+
+# Set working directory
+WORKDIR /app
+
+# Install git (for go get) and build tools
+RUN apk add --no-cache git
+
+# Copy go.mod and go.sum first for better cache
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy the rest of the source code
+COPY . .
+
+# Build the Go app
+RUN go build -o app .
+
+# Stage 2: Create a minimal runtime image
+FROM alpine:latest
+
+# Set working directory
+WORKDIR /root/
+
+# Copy binary and .env file from builder
+COPY --from=builder /app/app .
+COPY .env .
+
+# Expose the port (optional, for documentation)
+EXPOSE 8080
+
+# Run the binary
+CMD ["./app"]