Fix remaining references to PostgreSQL 10

Dockerfile

@@ -151,12 +151,12 @@ RUN ln -sf /dev/stdout /var/log/apache2/access.log \
   && ln -sf /dev/stderr /var/log/apache2/error.log
 
 # Configure PosgtreSQL
-COPY postgresql.custom.conf.tmpl /etc/postgresql/10/main/
+COPY postgresql.custom.conf.tmpl /etc/postgresql/12/main/
 RUN chown -R postgres:postgres /var/lib/postgresql \
-  && chown postgres:postgres /etc/postgresql/10/main/postgresql.custom.conf.tmpl \
-  && echo "\ninclude 'postgresql.custom.conf'" >> /etc/postgresql/10/main/postgresql.conf
-RUN echo "host all all 0.0.0.0/0 md5" >> /etc/postgresql/10/main/pg_hba.conf \
-      && echo "host all all ::/0 md5" >> /etc/postgresql/10/main/pg_hba.conf
+  && chown postgres:postgres /etc/postgresql/12/main/postgresql.custom.conf.tmpl \
+  && echo "\ninclude 'postgresql.custom.conf'" >> /etc/postgresql/12/main/postgresql.conf
+RUN echo "host all all 0.0.0.0/0 md5" >> /etc/postgresql/12/main/pg_hba.conf \
+      && echo "host all all ::/0 md5" >> /etc/postgresql/12/main/pg_hba.conf
 
 # copy update scripts
 COPY openstreetmap-tiles-update-expire /usr/bin/