chore: Use env variable for root log level (DEV-3410)

docker-compose.yml

@@ -101,6 +101,7 @@ services:
       - knora-net
     environment:
       - TZ=Europe/Zurich
+      - LOG_LEVEL=
       - KNORA_AKKA_LOGLEVEL=DEBUG
       - KNORA_AKKA_STDOUT_LOGLEVEL=DEBUG
       - KNORA_WEBAPI_TRIPLESTORE_HOST=db
@@ -115,6 +116,7 @@ services:
       - KNORA_WEBAPI_KNORA_API_EXTERNAL_PORT=3333
       - KNORA_WEBAPI_DSP_INGEST_AUDIENCE=http://localhost:3340
       - KNORA_WEBAPI_DSP_INGEST_BASE_URL=http://ingest:3340
+      - DSP_API_LOG_LEVEL=INFO
       # - DSP_API_LOG_APPENDER=JSON # if this variable is set, JSON logs are activated locally
     deploy:
       resources:

webapi/src/main/scala/org/knora/webapi/util/Logger.scala

@@ -12,12 +12,18 @@ import zio.logging._
 import zio.logging.slf4j.bridge.Slf4jBridge
 
 object Logger {
+  private val envLogLevel = sys.env.getOrElse("DSP_API_LOG_LEVEL", "INFO").toUpperCase
+
+  private def rootLogLevel: LogLevel =
+    LogLevel.levels
+      .find(_.label == envLogLevel)
+      .getOrElse(throw new Exception(s"Expected a log level, but found $envLogLevel"))
 
   private val logFilter = LogFilter.LogLevelByNameConfig(
-    LogLevel.Info,
-      // Uncomment the following lines to change the log level for specific loggers:
-      // , ("zio.logging.slf4j", LogLevel.Debug)
-      // , ("SLF4J-LOGGER", LogLevel.Warning)
+    rootLogLevel,
+    // Uncomment the following lines to change the log level for specific loggers:
+    // , ("zio.logging.slf4j", LogLevel.Debug)
+    // , ("SLF4J-LOGGER", LogLevel.Warning)
   )
 
   private val logFormatText: LogFormat =