Add a Dockerfile

Dockerfile

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+FROM golang:1.24-alpine AS builder
+RUN apk add --no-cache git
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+COPY src/ ./src/
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o git-pages ./src
+FROM alpine:latest
+RUN apk --no-cache add ca-certificates git
+RUN addgroup -g 1000 -S appuser && \
+    adduser -u 1000 -S appuser -G appuser
+
+WORKDIR /app
+COPY --from=builder /app/git-pages .
+
+USER appuser
+EXPOSE 3333
+CMD ["./git-pages"]