devops: add old-fashioned scripts to run Mac M1 buildbot (#4649)

Even though we're undergoing migration to GitHub self-hosted runners,
they don't currently support running natively under Arm. The resulting build ends up to be
x86_64.

See actions/runner#805

browser_patches/buildbots/buildbot-mac-11.0-arm64.sh

@@ -0,0 +1,65 @@
+#!/bin/bash
+set -e
+set +x
+
+if [[ "$(uname)" != "Darwin" ]]; then
+  echo "ERROR: this script is designed to be run on OSX. Can't run on $(uname)"
+  exit 1
+fi
+
+MAC_MAJOR_MINOR_VERSION=$(sw_vers -productVersion | grep -o '^\d\+.\d\+')
+if [[ $MAC_MAJOR_MINOR_VERSION != "11.0" ]]; then
+  echo "ERROR: this script is designed to be run on OSX 10.15. Can't run on OSX $MAC_MAJOR_MINOR_VERSION"
+  exit 1
+fi
+
+
+if [[ ($1 == '--help') || ($1 == '-h') ]]; then
+  echo "usage: $(basename $0)"
+  echo
+  echo "Pull from upstream & run checkout_build_archive_upload.sh"
+  echo "in a safe way so that multiple instances of the script cannot be run"
+  echo
+  echo "This script is designed to be run as a cronjob"
+  exit 0
+fi
+
+if [[ (-z $AZ_ACCOUNT_KEY) || (-z $AZ_ACCOUNT_NAME) ]]; then
+  echo "ERROR: Either \$AZ_ACCOUNT_KEY or \$AZ_ACCOUNT_NAME environment variable is missing."
+  echo "       'Azure Account Name' and 'Azure Account Key' secrets that are required"
+  echo "       to upload builds ot Azure CDN."
+  exit 1
+fi
+
+if ! command -v az >/dev/null; then
+  echo "ERROR: az is not found in PATH"
+  exit 1
+fi
+
+# Setup a LOCKDIR so that we don't run the same script multiple times.
+LOCKDIR="/tmp/$(basename $0).lock"
+if [[ -d ${LOCKDIR} ]]; then
+  echo "Already running (lockdir $LOCKDIR exists. Remove it manually if running)"
+  exit 0
+fi
+
+mkdir -p $LOCKDIR
+# make sure the lockfile is removed when we exit and then claim it
+trap "rm -rf ${LOCKDIR}; cd $(pwd -P); exit" INT TERM EXIT
+cd "$(dirname "$0")"
+
+IS_FIRST_RUN_FILE="/tmp/pw-buildbot-first-run.txt";
+if ! [[ -f $IS_FIRST_RUN_FILE ]]; then
+  source ./send_telegram_message.sh
+  send_telegram_message '**Mac 10.15 Buildbot Is Active**'
+fi
+touch "$IS_FIRST_RUN_FILE"
+
+# Check if git repo is dirty.
+if [[ -n $(git status -s) ]]; then
+  echo "ERROR: dirty GIT state - commit everything and re-run the script."
+  exit 1
+fi
+
+git pull origin master
+../checkout_build_archive_upload.sh webkit-mac-11.0-arm64 >/tmp/$(basename $0)--webkit-mac-11.0-arm64.log || true