Add debug output to log.txt

Author: koppor

Diff for: CHANGELOG.md

@@ -24,6 +24,7 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 
 - 'Get full text' now also checks the file url. [#568](https://github.com/koppor/jabref/issues/568)
 - We refined the 'main directory not found' error message. [#9625](https://github.com/JabRef/jabref/pull/9625)
+- `log.txt` now contains debug messages. Debugging needs to be enabled explicitly.
 - `log.txt` does not contain entries for non-found files during PDF indexing.
 - We modified the `Add Group` dialog to use the most recently selected group hierarchical context [#9141](https://github.com/JabRef/jabref/issues/9141)
 

Diff for: src/main/java/org/jabref/cli/Launcher.java

@@ -105,7 +105,7 @@ private static void addLogToDisk() {
         // https://tinylog.org/v2/configuration/#shared-file-writer
         Map<String, String> configuration = Map.of(
                 "writerFile", "shared file",
-                "writerFile.level", "info",
+                "writerFile.level", "debug",
                 "writerFile.file", directory.resolve("log.txt").toString(),
                 "writerFile.charset", "UTF-8");