updated drone steps

Dockerfile

@@ -1,5 +1,24 @@
-FROM alpine
+# Build stage
+FROM docker.io/library/golang:1.26-alpine AS builder
 
-RUN apk add --update --no-cache iptables iptables-legacy openssl jq curl ca-certificates busybox-extras docker-cli
-COPY firewall/ /firewall/
-CMD firewall/iptables-wrapper-installer.sh && /firewall/firewall-add
+WORKDIR /build
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+RUN go build -o network-go -ldflags="-s -w" .
+
+# Runtime stage
+FROM docker.io/library/alpine:latest
+
+RUN apk add --update --no-cache \
+    iptables \
+    iptables-legacy \
+    ca-certificates \
+    util-linux \
+    nsenter \
+    && rm -rf /var/cache/apk/*
+
+COPY --from=builder /build/network-go /usr/local/bin/network-go
+
+CMD ["/usr/local/bin/network-go"]