update: fetch latest Geckodriver via GH api

NodeFirefox/Dockerfile

@@ -31,10 +31,11 @@ RUN if [ "$(dpkg --print-architecture)" = "amd64" ]; then \
 # GeckoDriver
 #============
 ARG GECKODRIVER_VERSION=latest
-RUN DRIVER_ARCH=$(if [ "$(dpkg --print-architecture)" = "amd64" ]; then echo "linux64"; else echo "linux-aarch64"; fi) \
-  && GK_VERSION=$(if [ ${GECKODRIVER_VERSION:-latest} = "latest" ]; then echo "0.34.0"; else echo $GECKODRIVER_VERSION; fi) \
+RUN if LATEST_VERSION=$(curl -s https://api.github.com/repos/mozilla/geckodriver/releases/latest | jq -r '.tag_name') \
+  && DRIVER_ARCH=$(if [ "$(dpkg --print-architecture)" = "amd64" ]; then echo "linux64"; else echo "linux-aarch64"; fi) \
+  && GK_VERSION=$(if [ ${GECKODRIVER_VERSION:-latest} = "latest" ]; then echo "${LATEST_VERSION}"; 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}-${DRIVER_ARCH}.tar.gz \
+  && wget --no-verbose -O /tmp/geckodriver.tar.gz https://github.com/mozilla/geckodriver/releases/download/${GK_VERSION}/geckodriver-${GK_VERSION}-${DRIVER_ARCH}.tar.gz \
   && rm -rf /opt/geckodriver \
   && tar -C /opt -zxf /tmp/geckodriver.tar.gz \
   && rm /tmp/geckodriver.tar.gz \