Switch GitHub Action to ARM runner

[jimsihk]

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[jimsihk]

#33 [linux/386 4/4] RUN /usr/libexec/moodle/download-moodle-code     && cp -p /var/www/html/admin/cli/isinstalled.php /usr/libexec/moodle/
#33 25.42 Segmentation fault (core dumped)
#33 25.48 fatal: Unable to create '/tmp/moodle/.git/index.lock': File exists.
#33 25.48 
#33 25.48 Another git process seems to be running in this repository, e.g.
#33 25.48 an editor opened by 'git commit'. Please make sure all processes
#33 25.48 are terminated then try again. If it still fails, a git process
#33 25.48 may have crashed in this repository earlier:
#33 25.48 remove the file manually to continue.
#33 25.48 Attempting to fetch last 5 commits...
#33 28.35 From https://github.com/moodle/moodle
#33 28.35  * branch              MOODLE_405_STABLE -> FETCH_HEAD
#33 28.43 fatal: Unable to create '/tmp/moodle/.git/index.lock': File exists.
#33 28.43 
#33 28.43 Another git process seems to be running in this repository, e.g.
#33 28.43 an editor opened by 'git commit'. Please make sure all processes
#33 28.43 are terminated then try again. If it still fails, a git process
#33 28.43 may have crashed in this repository earlier:
#33 28.43 remove the file manually to continue.
#33 28.43 Attempting to fetch last 10 commits...