Issue #274 - Build broken due to missing Firefox dependency

Author: ppodgorsek

Dockerfile

@@ -28,7 +28,7 @@ ENV ALPINE_GLIBC 2.31-r0
 ENV CHROMIUM_VERSION 81.0
 ENV DATABASE_LIBRARY_VERSION 1.2
 ENV FAKER_VERSION 5.0.0
-ENV FIREFOX_VERSION 68.7
+ENV FIREFOX_VERSION 68
 ENV FTP_LIBRARY_VERSION 1.9
 ENV GECKO_DRIVER_VERSION v0.26.0
 ENV IMAP_LIBRARY_VERSION 0.3.0