delete wg interfaces on netclient docker shutdown

docker/Dockerfile-netclient-multiarch-userspace

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+FROM gravitl/go-builder:latest as builder
+# add glib support daemon manager
+WORKDIR /app
+
+COPY . .
+
+ENV GO111MODULE=auto
+
+RUN GOOS=linux GOARCH=amd64 CGO_ENABLED=0 /usr/local/go/bin/go build -ldflags="-w -s" -o netclient-app netclient/main.go
+
+WORKDIR /root/
+
+RUN apk add --update git build-base libmnl-dev iptables
+
+RUN git clone https://git.zx2c4.com/wireguard-go && \
+    cd wireguard-go && \
+    make && \
+    make install
+
+ENV WITH_WGQUICK=yes
+RUN git clone https://git.zx2c4.com/wireguard-tools && \
+    cd wireguard-tools && \
+    cd src && \
+    make && \
+    make install
+
+FROM alpine:3.13.6
+
+WORKDIR /root/
+
+RUN apk add --no-cache --update bash libmnl gcompat iptables openresolv iproute2
+COPY --from=builder /usr/bin/wireguard-go /usr/bin/wg* /usr/bin/
+COPY --from=builder /app/netclient-app ./netclient
+COPY --from=builder /app/scripts/netclient.sh .
+RUN chmod 0755 netclient && chmod 0755 netclient.sh
+
+ENV WG_QUICK_USERSPACE_IMPLEMENTATION=wireguard-go
+
+ENTRYPOINT ["/bin/bash", "./netclient.sh"]