Add monitoring

monitoring/pinger/dockerfile

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+# Build stage
+FROM golang:bullseye as base
+
+# Install iperf3
+RUN apt-get update && apt-get install -y iperf3 && apt-get clean
+
+RUN adduser \
+  --disabled-password \
+  --gecos "" \
+  --home "/nonexistent" \
+  --shell "/sbin/nologin" \
+  --no-create-home \
+  --uid 65532 \
+  small-user
+
+WORKDIR /app
+
+COPY . .
+
+# RUN go mod download
+# RUN go mod verify
+
+RUN GOFLAGS=-mod=vendor CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o main .
+
+# Final stage
+FROM alpine:latest
+
+# Install iperf3 in Alpine
+RUN apk add --no-cache iperf3
+
+# Copy the binary from the build stage
+COPY --from=base /app/main /main
+
+# Copy necessary files from the build stage
+COPY --from=base /usr/share/zoneinfo /usr/share/zoneinfo
+COPY --from=base /etc/passwd /etc/passwd
+COPY --from=base /etc/group /etc/group
+
+# Use the non-root user
+USER small-user
+EXPOSE 8090
+
+CMD ["/main"]