[macOS] install geckodriver from binaries for 10.13 (#2559)

* install geckodriver from binaries for hs

* unite add to path block

* minor comment change

* fix variable name

* jg -r instead of tr

* change geckourl

images/macos/provision/core/firefox.sh

@@ -4,10 +4,19 @@ source ~/utils/utils.sh
 echo "Installing Firefox..."
 brew install --cask firefox
 
-echo "Installing Geckodriver..."
-brew_smart_install "geckodriver"
+# High Sierra builds driver from sources, and it takes about 2 hours. It's much faster to download the binary directly
+if ! is_HighSierra; then
+    echo "Installing Geckodriver..."
+    brew_smart_install "geckodriver"
+    geckoPath="$(brew --prefix geckodriver)/bin"
+else
+    geckoUrl="$(curl -s https://api.github.com/repos/mozilla/geckodriver/releases/latest | jq -r '.assets[].browser_download_url | select(endswith("macos.tar.gz"))')"
+    download_with_retries $geckoUrl "/tmp" "geckodriver.tar.gz"
+    geckoPath="/usr/local/bin"
+    tar -xzf /tmp/geckodriver.tar.gz -C $geckoPath
+fi
 
 echo "Add GECKOWEBDRIVER to bashrc..."
-echo "export GECKOWEBDRIVER=$(brew --prefix geckodriver)/bin" >> "${HOME}/.bashrc"
+echo "export GECKOWEBDRIVER=${geckoPath}" >> "${HOME}/.bashrc"
 
 invoke_tests "Browsers" "Firefox"