Add a Dockerfile

Dockerfile

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+FROM golang:1.19-alpine
+
+# Set the Current Working Directory inside the container
+WORKDIR /app
+
+# pre-copy/cache go.mod for pre-downloading dependencies and only redownloading them in subsequent builds if they change
+COPY go.mod go.sum ./
+RUN go mod download && go mod verify
+
+# Copy everything from the current directory to the PWD(Present Working Directory) inside the container
+COPY . .
+
+# Build the Go app
+RUN go build -o app .
+
+# Expose port 8080 to the outside world
+EXPOSE 8080
+
+# Command to run the executable
+CMD ["./app"]