allow fixing the version from an env var

[koenhandekyn]

our system broke with change from 133.x to 134.x

currently we can only set the channel but we can't pin the version

it's a very small change to allow to pin the version which likely is relevant to provide

(we have it on a fork if needed)

snippet

# Detect requested version or channel or default to stable
if [ -f "$ENV_DIR/GOOGLE_CHROME_VERSION" ]; then
  VERSION=$(cat "$ENV_DIR/GOOGLE_CHROME_VERSION")
  echo "Using env var GOOGLE_CHROME_VERSION=$VERSION" | indent
else
  if [ -f "$ENV_DIR/GOOGLE_CHROME_CHANNEL" ]; then
    channel=$(cat "$ENV_DIR/GOOGLE_CHROME_CHANNEL")
    echo "Using env var GOOGLE_CHROME_CHANNEL=$channel" | indent
  else
    channel=stable
  fi
  # The current version endpoint requires ALL CAPS.
  CHANNEL="$(echo -n "$channel" | awk '{ print toupper($0) }')"
  VERSION="$(curl --silent --show-error --fail --retry 3 --retry-connrefused --connect-timeout 10 "https://googlechromelabs.github.io/chrome-for-testing/LATEST_RELEASE_$CHANNEL")"
  echo "Resolved $CHANNEL version $VERSION" | indent
fi