feat: add Dockerfile

Dockerfile

@@ -0,0 +1,29 @@
+# Use the official Go image as a parent image
+FROM golang:1.22 as builder
+
+# Set the working directory inside the container
+WORKDIR /app
+
+# Copy the go.mod and go.sum files
+COPY go.* ./
+
+# Download all dependencies. Dependencies will be cached if the go.mod and go.sum files are not changed
+RUN go mod download
+
+# Copy the source code into the container
+COPY . .
+
+# Build the application
+RUN CGO_ENABLED=0 GOOS=linux go build -v -o btcpaychecker cmd/btcpaychecker/main.go
+
+# Use the alpine image for a smaller footprint
+FROM alpine:latest  
+RUN apk --no-cache add ca-certificates
+
+WORKDIR /root/
+
+# Copy the pre-built binary file from the previous stage
+COPY --from=builder /app/btcpaychecker .
+
+# Command to run the executable
+CMD ["./btcpaychecker"]