add initial Dockerfile

Dockerfile

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+FROM mcr.microsoft.com/powershell:latest
+
+WORKDIR /
+
+RUN pwsh -c 'Set-PSRepository -Name "PSGallery" -InstallationPolicy Trusted' \
+ && pwsh -c 'Install-Module powershell-yaml' \
+ && apt-get update \
+ && apt-get -y install iptables \
+ && rm -rf /var/cache/apt
+
+COPY expose_forwards.ps1 docker/entrypoint.sh ./
+
+ENTRYPOINT ["./entrypoint.sh"]

docker/entrypoint.sh

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+#!/bin/bash
+
+while :; do
+    pwsh -File expose_forwards.ps1
+    sleep 33
+done