Added grass-core, support for grass 7.6

Dockerfile

@@ -18,7 +18,7 @@ RUN printf "deb     http://mirror.steadfast.net/debian/    stable main contrib n
 RUN printf "deb     http://mirror.steadfast.net/debian/    testing main contrib non-free\ndeb-src http://mirror.steadfast.net/debian/    testing main contrib non-free" > /etc/apt/sources.list.d/testing.list
 
 # Install Node.js GDAL, nginx, letsencrypt, psql
-RUN apt-get -qq update && apt-get -qq install -t testing -y binutils libproj-dev gdal-bin nginx && apt-get -qq install -y gettext-base cron certbot postgresql-client-9.6
+RUN apt-get -qq update && apt-get -qq install -t testing -y binutils libproj-dev gdal-bin nginx grass-core && apt-get -qq install -y gettext-base cron certbot postgresql-client-9.6
 
 
 # Install pip reqs

app/plugins/grass_engine.py

@@ -15,7 +15,8 @@ class GrassEngine:
     def __init__(self):
         self.grass_binary = shutil.which('grass7') or \
                             shutil.which('grass72') or \
-                            shutil.which('grass74')
+                            shutil.which('grass74') or \
+                            shutil.which('grass76')
 
         if self.grass_binary is None:
             logger.warning("Could not find a GRASS 7 executable. GRASS scripts will not work.")