Add Dockerfile and start script for GitHub Actions runner setup

.github/runner/Dockerfile

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+FROM ubuntu:latest
+
+ARG RUNNER_VERSION="2.323.0"
+
+# Prevents installdependencies.sh from prompting the user and blocking the image creation
+ARG DEBIAN_FRONTEND=noninteractive
+
+RUN apt update -y && apt upgrade -y && useradd -m docker
+RUN apt install -y --no-install-recommends \
+    curl jq build-essential libssl-dev libffi-dev python3 python3-venv python3-dev python3-pip \
+    # dot net core dependencies
+    libicu74  libssl3 libkrb5-3 zlib1g libcurl4
+
+
+RUN cd /home/docker && mkdir actions-runner && cd actions-runner \
+    && curl -O -L https://github.com/actions/runner/releases/download/v${RUNNER_VERSION}/actions-runner-linux-x64-${RUNNER_VERSION}.tar.gz \
+    && tar xzf ./actions-runner-linux-x64-${RUNNER_VERSION}.tar.gz
+
+RUN chown -R docker ~docker && /home/docker/actions-runner/bin/installdependencies.sh
+
+COPY start.sh start.sh
+
+# make the script executable
+RUN chmod +x start.sh
+
+# since the config and run script for actions are not allowed to be run by root,
+# set the user to "docker" so all subsequent commands are run as the docker user
+USER docker
+
+ENTRYPOINT ["./start.sh"]

.github/runner/start.sh

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+#!/bin/bash
+
+REPOSITORY=$REPO
+ACCESS_TOKEN=$GH_TOKEN
+LABELS=$RUNNER_LABELS
+
+# echo "REPO ${REPOSITORY}"
+# echo "ACCESS_TOKEN ${ACCESS_TOKEN}"
+
+REG_TOKEN=$(curl -X POST -H "Authorization: token ${ACCESS_TOKEN}" -H "Accept: application/vnd.github+json" https://api.github.com/repos/${REPOSITORY}/actions/runners/registration-token | jq .token --raw-output)
+
+cd /home/docker/actions-runner
+
+./config.sh --url https://github.com/${REPOSITORY} --token ${REG_TOKEN} --labels ${LABELS}
+
+cleanup() {
+    echo "Removing runner..."
+    ./config.sh remove --unattended --token ${REG_TOKEN}
+}
+
+trap 'cleanup; exit 130' INT
+trap 'cleanup; exit 143' TERM
+
+./run.sh & wait $!