fixes invalid folder check

-f check if a file exists. -d checks if the dir exists

packaging/deb/control/postinst

@@ -31,13 +31,13 @@ case "$1" in
     cp /usr/share/grafana/conf/ldap.toml /etc/grafana/ldap.toml
   fi
 
-  if [ ! -f $PROVISIONING_CFG_DIR ]; then
+  if [ ! -d $PROVISIONING_CFG_DIR ]; then
     mkdir -p $PROVISIONING_CFG_DIR/dashboards $PROVISIONING_CFG_DIR/datasources
     cp /usr/share/grafana/conf/provisioning/dashboards/sample.yaml $PROVISIONING_CFG_DIR/dashboards/sample.yaml
     cp /usr/share/grafana/conf/provisioning/datasources/sample.yaml $PROVISIONING_CFG_DIR/datasources/sample.yaml
   fi
 
-  if [ ! -f $PROVISIONING_CFG_DIR/notifiers ]; then
+  if [ ! -d $PROVISIONING_CFG_DIR/notifiers ]; then
     mkdir -p $PROVISIONING_CFG_DIR/notifiers
     cp /usr/share/grafana/conf/provisioning/notifiers/sample.yaml $PROVISIONING_CFG_DIR/notifiers/sample.yaml
   fi

packaging/rpm/control/postinst

@@ -45,13 +45,13 @@ if [ $1 -eq 1 ] ; then
     cp /usr/share/grafana/conf/ldap.toml /etc/grafana/ldap.toml
   fi
 
-  if [ ! -f $PROVISIONING_CFG_DIR ]; then
+  if [ ! -d $PROVISIONING_CFG_DIR ]; then
     mkdir -p $PROVISIONING_CFG_DIR/dashboards $PROVISIONING_CFG_DIR/datasources
     cp /usr/share/grafana/conf/provisioning/dashboards/sample.yaml $PROVISIONING_CFG_DIR/dashboards/sample.yaml
     cp /usr/share/grafana/conf/provisioning/datasources/sample.yaml $PROVISIONING_CFG_DIR/datasources/sample.yaml
   fi
 
-  if [ ! -f $PROVISIONING_CFG_DIR/notifiers ]; then
+  if [ ! -d $PROVISIONING_CFG_DIR/notifiers ]; then
     mkdir -p $PROVISIONING_CFG_DIR/notifiers
     cp /usr/share/grafana/conf/provisioning/notifiers/sample.yaml $PROVISIONING_CFG_DIR/notifiers/sample.yaml
   fi