Dont install broken docker-compose on ARM

Dockerfile.base

@@ -36,6 +36,7 @@ RUN apt-get update && \
     openssh-client \
     locales \
     python3-pip \
+    jq \
   && pip3 install --no-cache-dir awscliv2 \
   && locale-gen en_US.UTF-8 \
   && dpkg-reconfigure locales \
@@ -54,7 +55,7 @@ RUN apt-get update && \
   && [[ $(lsb_release -cs) == "focal" ]] && ( add-apt-repository "deb [arch=$(dpkg --print-architecture)] https://download.docker.com/linux/ubuntu focal stable" ) || ( add-apt-repository "deb [arch=$(dpkg --print-architecture)] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" ) \
   && apt-get update \
   && apt-get install -y docker-ce docker-ce-cli containerd.io --no-install-recommends --allow-unauthenticated \
-  && curl -sL "https://github.com/docker/compose/releases/download/${DOCKER_COMPOSE_VERSION}/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose \
+  && [[ $(lscpu -J | jq -r '.lscpu[] | select(.field == "Vendor ID:") | .data') == "ARM" ]] && echo "Not installing docker-compose. See https://github.com/docker/compose/issues/6831" || ( curl -sL "https://github.com/docker/compose/releases/download/${DOCKER_COMPOSE_VERSION}/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose ) \
   && chmod +x /usr/local/bin/docker-compose \
   && rm -rf /var/lib/apt/lists/* \
   && rm -rf /tmp/*

README.md

@@ -7,12 +7,19 @@ This will run the [new self-hosted github actions runners](https://help.github.c
 
 ## Notes ##
 
+### Docker Support ###
+
 Please note that while this runner installs and allows docker, github actions itself does not support using docker from a self hosted runner yet. 
 For more information:
 
 * https://github.com/actions/runner/issues/406
 * https://github.com/actions/runner/issues/367
 
+### Docker-Compose on ARM ###
+
+Please note `docker-compose` does not currently work on ARM ([see issue](https://github.com/docker/compose/issues/6831)) so it is not installed on ARM based builds here.
+A workaround exists, please see [here](https://github.com/myoung34/docker-github-actions-runner/issues/72#issuecomment-804723656)
+
 ## Docker Artifacts ##
 
 | Container Base | Supported Architectures | Tag Regex | Docker Tags | Description | Notes |