fix: added local jar build script

custom-log4j2-appender/build-local.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+# clean existing stuff
+rm -rf build io
+# copy correct build.gradle
+cp build-shadowJar.gradle build.gradle
+
+# Get the current directory (assuming the script is run from the custom-log4j2-appender directory)
+CURRENT_DIR=$(pwd)
+PROJECT_ROOT=$(dirname "$CURRENT_DIR")
+
+echo "Current Directory: $CURRENT_DIR"
+echo "Project Root: $PROJECT_ROOT"
+
+# Clean and build the project
+cd "$PROJECT_ROOT"
+./gradlew clean build shadowJar 
+
+# Navigate to the directory containing the artifacts
+cd "$CURRENT_DIR/build/libs"
+
+# List the contents of the build/libs directory for debugging
+echo "Contents of build/libs:"
+ls -la
+
+echo "Local jar custom-log4j2-appender.jar is produced. You can now copy custom-log4j2-appender.jar to your applications classpath ."