fix(ci): Log default FQBN if not passed

Author: P-R-O-C-H-Y

Diff for: .github/scripts/sketch_utils.sh

@@ -416,6 +416,11 @@ function build_sketches(){ # build_sketches <ide_path> <user_path> <target> <pat
     echo "Start Sketch: $start_num"
     echo "End Sketch  : $end_index"
 
+    #if fqbn is not passed then set it to default for compilation log
+    if [ -z $fqbn ]; then
+        fqbn="espressif:esp32:$target"
+    fi
+
     sizes_file="$GITHUB_WORKSPACE/cli_compile_$chunk_index.json"
     if [ $log_compilation ]; then
         #echo board,target and start of sketches to sizes_file json