First commit. Everything working as intended.

Dockerfile

@@ -0,0 +1,15 @@
+ARG UBUNTU_VER
+
+FROM ubuntu:${UBUNTU_VER}
+
+ARG TARGETPLATFORM
+
+RUN apt update
+
+RUN apt install -y curl wget nano lsb-core nano
+
+RUN apt install -y net-tools iputils-ping tcpdump traceroute iproute2 iptables
+
+COPY scripts/entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT [ "/entrypoint.sh" ]

TAG_LIST.txt

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+UBUNTU_VER=22.04 TAG=/ubuntu-$UBUNTU_VER:`date "+%Y-%m-%d"`
+UBUNTU_VER=22.04 TAG=/ubuntu-$UBUNTU_VER:latest
+UBUNTU_VER=22.04 TAG=:ubuntu-$UBUNTU_VER\_latest
+
+UBUNTU_VER=22.04 TAG=:latest

build_command.sh

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+echo Image TAG: $TAG
+
+docker buildx build . \
+    -f Dockerfile \
+    --build-arg UBUNTU_VER \
+    -t registry.ahkhan.me/docker/ubuntu$TAG \
+    --platform linux/amd64,linux/arm64,linux/arm/v7 \
+    --push

scripts/entrypoint.sh

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+#!/usr/bin/env bash
+set -x
+
+term_handler() {
+  exit 143; # 128 + 15 -- SIGTERM
+}
+
+trap 'kill ${!}; term_handler' SIGTERM
+
+tail -f /dev/null & wait ${!}