Add Dockerfile for building and running Go application

Dockerfile

@@ -0,0 +1,32 @@
+# Use the official Go image
+FROM golang:1.19 AS build
+
+# Set the working directory
+WORKDIR /app
+
+# Copy go mod and sum files
+COPY go.mod go.sum ./
+
+# Download dependencies
+RUN go mod download
+
+# Copy source code
+COPY . .
+
+# Build the application
+RUN go build -o main .
+
+# Use a lightweight image for deployment
+FROM alpine:latest AS runtime
+
+# Install necessary libraries
+RUN apk --no-cache add ca-certificates
+
+# Copy binary
+COPY --from=build /app/main /app/
+
+# Set the working directory
+WORKDIR /app
+
+# Run the application
+CMD [". --download-only"]