fix installation geckodriver in docker (#258)

Dockerfile

@@ -32,13 +32,11 @@ RUN FIREFOX_URI="https://download.mozilla.org/?product=firefox-latest&os=linux64
     ln -s /usr/local/firefox/firefox /usr/local/bin/firefox
 
 # Install Geckodriver
-RUN GECKODRIVER_META="https://api.github.com/repos/mozilla/geckodriver/releases/latest" && \
-    GECKODRIVER_LATEST_RELEASE_URL=$(curl $GECKODRIVER_META | jq -r ".assets[] | select(.name | test(\"linux64\")) | .browser_download_url") && \
-    curl --silent --show-error --location --fail --retry 3 --output /tmp/geckodriver_linux64.tar.gz "$GECKODRIVER_LATEST_RELEASE_URL"  && \
-    cd /tmp  && \
-    tar xf geckodriver_linux64.tar.gz  && \
-    chmod +x geckodriver && \
-    mv geckodriver /usr/local/bin/
+RUN GECKODRIVER_URL=https://github.com/mozilla/geckodriver/releases/download && \
+    VERSION=$(curl -sL https://api.github.com/repos/mozilla/geckodriver/releases/latest | \
+    grep tag_name | cut -d '"' -f 4) && \
+    curl -sL "$GECKODRIVER_URL/$VERSION/geckodriver-$VERSION-linux64.tar.gz" | \
+    tar -xz -C /usr/local/bin
 
 WORKDIR /etaoin
 COPY ./ ./