Update TurboVNC to 2.2.6

Author: manics

Dockerfile

@@ -14,10 +14,11 @@ RUN apt-get -y update \
    xubuntu-icon-theme
 
 # Remove light-locker to prevent screen lock
-RUN wget 'https://sourceforge.net/projects/turbovnc/files/2.2.5/turbovnc_2.2.5_amd64.deb/download' -O turbovnc_2.2.5_amd64.deb && \
-   apt-get install -y -q ./turbovnc_2.2.5_amd64.deb && \
+ARG TURBOVNC_VERSION=2.2.6
+RUN wget -q "https://sourceforge.net/projects/turbovnc/files/${TURBOVNC_VERSION}/turbovnc_${TURBOVNC_VERSION}_amd64.deb/download" -O turbovnc_${TURBOVNC_VERSION}_amd64.deb && \
+   apt-get install -y -q ./turbovnc_${TURBOVNC_VERSION}_amd64.deb && \
    apt-get remove -y -q light-locker && \
-   rm ./turbovnc_2.2.5_amd64.deb && \
+   rm ./turbovnc_${TURBOVNC_VERSION}_amd64.deb && \
    ln -s /opt/TurboVNC/bin/* /usr/local/bin/
 
 # apt-get may result in root-owned directories/files under $HOME