build(docker): add Dockerfile

Dockerfile

@@ -0,0 +1,28 @@
+ARG SCRIPT_NAME=ipregion.sh
+ARG WORK_DIR=/app
+ARG USER=ipregion
+
+FROM alpine:3.21
+
+ARG SCRIPT_NAME
+ARG WORK_DIR
+ARG USER
+
+RUN apk add --no-cache \
+  curl \
+  jq \
+  bash \
+  util-linux \
+  iputils \
+  grep
+
+WORKDIR $WORK_DIR
+
+COPY $SCRIPT_NAME .
+
+RUN adduser --disabled-password --home $WORK_DIR $USER && \
+  chmod +x $SCRIPT_NAME
+
+USER $USER
+
+ENTRYPOINT ["./ipregion.sh"]