Multiarch builds fixed for #4

Author: Pentusha

Dockerfile

@@ -3,6 +3,7 @@ LABEL maintainer="3vilpenguin@gmail.com"
 
 ARG GIT_VERSION="2.23.0"
 ARG GH_RUNNER_VERSION="2.165.1"
+ARG TARGETPLATFORM
 
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 # hadolint ignore=DL3003
@@ -43,7 +44,7 @@ WORKDIR /actions-runner
 COPY install_actions.sh /actions-runner
 
 RUN chmod +x /actions-runner/install_actions.sh \
-  && /actions-runner/install_actions.sh ${GH_RUNNER_VERSION} \
+  && /actions-runner/install_actions.sh ${GH_RUNNER_VERSION} ${TARGETPLATFORM} \
   && rm /actions-runner/install_actions.sh
 
 WORKDIR /_work

install_actions.sh

@@ -1,13 +1,14 @@
 #!/bin/bash -x
 GH_RUNNER_VERSION=$1
+TARGETPLATFORM=$2
 
-export ACTIONS_ARCH="x64"
-if [[ $(dpkg --print-architecture) == "armhf" ]]; then
-  export ACTIONS_ARCH="arm"
-elif [[ $(dpkg --print-architecture) == "arm64" ]]; then
-  export ACTIONS_ARCH="arm64"
+export TARGET_ARCH="x64"
+if [[ $TARGETPLATFORM == "linux/arm/v7" ]]; then
+  export TARGET_ARCH="arm"
+elif [[ $TARGETPLATFORM == "linux/arm64" ]]; then
+  export TARGET_ARCH="arm64"
 fi
-curl -L "https://github.com/actions/runner/releases/download/v${GH_RUNNER_VERSION}/actions-runner-linux-x64-${GH_RUNNER_VERSION}.tar.gz" > actions.tar.gz
+curl -L "https://github.com/actions/runner/releases/download/v${GH_RUNNER_VERSION}/actions-runner-linux-${TARGET_ARCH}-${GH_RUNNER_VERSION}.tar.gz" > actions.tar.gz
 tar -zxf actions.tar.gz
 rm -f actions.tar.gz
 ./bin/installdependencies.sh