add dockerfile (#42)

Dockerfile

@@ -0,0 +1,27 @@
+# Build stage
+FROM golang:1.22-alpine AS builder
+
+WORKDIR /go/src/goignore
+
+# Install git
+RUN apk add --no-cache git
+
+# Clone the repository and build the goignore executable
+RUN git clone https://github.com/hacktivist123/goignore . && \
+  go build -o /go/bin/goignore ./cmd/goignore
+
+# goignore Container Image
+FROM alpine:latest
+
+# Maintainer info
+LABEL org.opencontainers.image.authors="Shedrack Akintayo" \
+  org.opencontainers.image.description="Container image for https://github.com/hacktivist123/goignore"
+
+# Set the working directory
+WORKDIR /goignore
+
+# Copy the goignore executable from the builder stage
+COPY --from=builder /go/bin/goignore /usr/local/bin/goignore
+
+# Set the entrypoint
+ENTRYPOINT [ "goignore" ]