Add some unit test and dockerfile

Dockerfile

@@ -0,0 +1,12 @@
+FROM docker.io/golang:1.24.2-bookworm as build
+WORKDIR /app
+# Copy dependencies list
+COPY ./app/go.mod ./
+COPY ./app/go.sum ./
+# Build with optional lambda.norpc tag
+COPY ./app/main.go ./
+RUN go build -tags lambda.norpc -o main main.go
+# Copy artifacts to a clean image
+FROM public.ecr.aws/lambda/provided:al2023
+COPY --from=build /app/main ${LAMBDA_TASK_ROOT}
+ENTRYPOINT [ "main" ]