upgrade leaflet from v1.7.1 to v1.8.0

Leaflet 1.8.0	Stable version, released on April 18, 2022.
Leaflet 1.7.1	Previous stable version, released on September 3, 2020.

install leaflet localy so server works offline

Dockerfile

@@ -102,10 +102,16 @@ RUN echo "LoadModule tile_module /usr/lib/apache2/modules/mod_tile.so" >> /etc/a
 && echo "LoadModule headers_module /usr/lib/apache2/modules/mod_headers.so" >> /etc/apache2/conf-available/mod_headers.conf \
 && a2enconf mod_tile && a2enconf mod_headers
 COPY apache.conf /etc/apache2/sites-available/000-default.conf
-COPY leaflet-demo.html /var/www/html/index.html
 RUN ln -sf /dev/stdout /var/log/apache2/access.log \
 && ln -sf /dev/stderr /var/log/apache2/error.log
 
+# leaflet
+COPY leaflet-demo.html /var/www/html/index.html
+RUN cd /var/www/html/ \
+&& wget https://github.com/Leaflet/Leaflet/releases/download/v1.8.0/leaflet.zip \
+&& unzip leaflet.zip \
+&& rm leaflet.zip
+
 # Copy update scripts
 COPY openstreetmap-tiles-update-expire.sh /usr/bin/
 RUN chmod +x /usr/bin/openstreetmap-tiles-update-expire.sh \