Going back to a hardcoded GeckoDriver version for docker builds. (#805)

This avoids builds that fail when the GitHub API quota is reached. From
now on, the version needs to be updated manually.

Author: diemol

NodeFirefox/Dockerfile.txt

@@ -20,7 +20,7 @@ RUN FIREFOX_DOWNLOAD_URL=$(if [ $FIREFOX_VERSION = "latest" ] || [ $FIREFOX_VERS
 # GeckoDriver
 #============
 ARG GECKODRIVER_VERSION=latest
-RUN GK_VERSION=$(if [ ${GECKODRIVER_VERSION:-latest} = "latest" ]; then echo $(wget -qO- "https://api.github.com/repos/mozilla/geckodriver/releases/latest" | grep '"tag_name":' | sed -E 's/.*"v([0-9.]+)".*/\1/'); else echo $GECKODRIVER_VERSION; fi) \
+RUN GK_VERSION=$(if [ ${GECKODRIVER_VERSION:-latest} = "latest" ]; then echo "0.23.0"; else echo $GECKODRIVER_VERSION; fi) \
   && echo "Using GeckoDriver version: "$GK_VERSION \
   && wget --no-verbose -O /tmp/geckodriver.tar.gz https://github.com/mozilla/geckodriver/releases/download/v$GK_VERSION/geckodriver-v$GK_VERSION-linux64.tar.gz \
   && rm -rf /opt/geckodriver \