Adds testing-host w/ a dummy project.

docker/testing-host/Dockerfile

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+FROM ubuntu:22.04
+
+ARG TARGETPLATFORM
+
+# https://download.docker.com/linux/static/stable/
+ARG DOCKER_VERSION=20.10.18
+# https://github.com/docker/compose/releases
+# Reverted to 2.6.1 because of this https://github.com/docker/compose/issues/9704. 2.9.0 still has a bug.
+ARG DOCKER_COMPOSE_VERSION=2.6.1
+# https://github.com/buildpacks/pack/releases
+ARG PACK_VERSION=v0.27.0
+
+ENV DEBIAN_FRONTEND noninteractive
+ENV TZ=UTC
+
+RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
+
+RUN apt-get update \
+    && apt-get install -y gnupg gosu curl ca-certificates zip unzip git git-lfs supervisor  \
+        sqlite3 libcap2-bin libpng-dev python2 dnsutils openssh-server sudo \
+    && apt-get -y autoremove \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+# Setup sshd
+RUN ssh-keygen -A
+RUN mkdir -p /run/sshd
+
+# Install Docker CLI, Docker Compose, and Pack
+RUN mkdir -p ~/.docker/cli-plugins
+RUN curl -SL https://cdn.coollabs.io/bin/$TARGETPLATFORM/docker-$DOCKER_VERSION -o /usr/bin/docker
+RUN curl -SL https://cdn.coollabs.io/bin/$TARGETPLATFORM/docker-compose-linux-$DOCKER_COMPOSE_VERSION -o ~/.docker/cli-plugins/docker-compose
+RUN curl -SL https://cdn.coollabs.io/bin/$TARGETPLATFORM/pack-$PACK_VERSION -o /usr/local/bin/pack
+RUN curl -sSL https://nixpacks.com/install.sh | bash
+RUN chmod +x ~/.docker/cli-plugins/docker-compose /usr/bin/docker /usr/local/bin/pack
+RUN groupadd docker
+
+# Setup coolify user
+RUN useradd -ms /bin/bash coolify
+RUN usermod -aG sudo coolify
+RUN usermod -aG docker coolify
+RUN echo 'coolify ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
+
+# Setup ssh'ing into the destination as Coolify User
+USER coolify
+RUN mkdir -p ~/.ssh
+RUN echo "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFuGmoeGq/pojrsyP1pszcNVuZx9iFkCELtxrh31QJ68 coolify@coolify-instance" >> ~/.ssh/authorized_keys
+
+USER root
+
+# Setup ssh'ing into the destination as Root
+RUN mkdir -p ~/.ssh
+RUN echo "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFuGmoeGq/pojrsyP1pszcNVuZx9iFkCELtxrh31QJ68 coolify@coolify-instance" >> ~/.ssh/authorized_keys
+
+EXPOSE 22
+
+COPY start-container /usr/local/bin/start-container
+COPY supervisord.conf /etc/supervisor/conf.d/supervisord.conf
+RUN chmod +x /usr/local/bin/start-container
+
+WORKDIR /root
+
+# Prepare projects
+RUN mkdir -p projects
+COPY dummy-project projects/dummy-project
+
+ENTRYPOINT ["start-container"]