add file drop handler

You can define a folder and ingest files dropped into it.

pdb-ui/src/main/java/org/lucares/pdbui/domain/FileDropConfig.java

@@ -1,19 +1,24 @@
 package org.lucares.pdbui.domain;
 
 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.List;
 
 import org.apache.commons.lang3.StringUtils;
 
 public class FileDropConfig {
-    private List<FileDropSettings> settings = new ArrayList<>();
+    private final List<FileDropSettings> settings = new ArrayList<>();
 
     public List<FileDropSettings> getSettings() {
         return settings;
     }
 
-    public void setSettings(final List<FileDropSettings> settings) {
-        this.settings = settings;
+    public void setSettings(final Collection<FileDropSettings> settings) {
+        this.settings.addAll(settings);
+    }
+
+    public void addSettings(final FileDropSettings... dropSettings) {
+        this.settings.addAll(List.of(dropSettings));
     }
 
     @Override

pdb-ui/src/main/java/org/lucares/pdbui/domain/FileDropSettings.java

@@ -2,6 +2,11 @@ package org.lucares.pdbui.domain;
 
 import org.lucares.pdbui.CsvReaderSettings;
 
+/**
+ * @param match       ant style path matcher, e.g.
+ *                    {source}/{pod}/{host}/performance*.csv
+ * @param csvSettings
+ */
 public record FileDropSettings(String match, CsvReaderSettings csvSettings) {
 
 }