Build-in a Linux source mirror repository (#87)

To reduce the amount of network traffic used by BPF CI jobs, make a
full clone kernel-patches/bpf local to the runner image.

This mirror repo can later be used by libbpf/ci/get-linux-source
action as --reference [1].

[1] https://git-scm.com/docs/git-clone#Documentation/git-clone.txt---reference-if-ablerepository

Signed-off-by: Ihor Solodrai <[email protected]>

Author: theihor

Dockerfile

@@ -5,9 +5,11 @@ FROM myoung34/github-runner:ubuntu-${UBUNTU_VERSION}
 ARG UBUNTU_VERSION
 
 COPY install-dependencies.sh /tmp/install-dependencies.sh
-RUN /tmp/install-dependencies.sh
+RUN bash /tmp/install-dependencies.sh
 
 RUN apt-get clean
 
 COPY token.sh /token.sh
 
+COPY setup-mirror-repos.sh /tmp/setup-mirror-repos.sh
+RUN bash /tmp/setup-mirror-repos.sh

s390x.Dockerfile

@@ -59,6 +59,9 @@ RUN curl -Lf https://raw.githubusercontent.com/myoung34/docker-github-actions-ru
 # RUN curl -Lf https://raw.githubusercontent.com/myoung34/docker-github-actions-runner/${RUNNER_VERSION}/token.sh -o /token.sh && chmod 755 /token.sh
 COPY token.sh /token.sh
 
+COPY setup-mirror-repos.sh /tmp/setup-mirror-repos.sh
+RUN bash /tmp/setup-mirror-repos.sh
+
 RUN useradd -d ${RUNNER_HOME} -m runner
 RUN echo "runner ALL=(ALL) NOPASSWD: ALL" >>/etc/sudoers
 RUN echo "Defaults env_keep += \"DEBIAN_FRONTEND\"" >>/etc/sudoers

setup-mirror-repos.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+set -euo pipefail
+
+mkdir -p /libbpfci/mirrors
+git clone https://github.com/kernel-patches/bpf.git /libbpfci/mirrors/linux
+chmod -R a+rX /libbpfci/mirrors