CI: Restore sketch build flags

Author: willmmiles

.github/scripts/install-platformio.sh

@@ -18,10 +18,11 @@ function build_pio_sketch(){ # build_pio_sketch <board> <options> <path-to-ino>
     local board="$1"
     local options="$2"
     local sketch="$3"
+    local buildFlags="$4"
     local sketch_dir=$(dirname "$sketch")
     echo ""
     echo "Compiling '"$(basename "$sketch")"' ..."
-    python -m platformio ci --board "$board" "$sketch_dir" --project-option="$options" --project-option="framework=arduino"
+    python -m platformio ci -l "." --board "$board" "$sketch_dir" --project-option="$options" --project-option="build_flags=$buildFlags"
 }
 
 function count_sketches(){ # count_sketches <examples-path>
@@ -116,12 +117,18 @@ function build_pio_sketches(){ # build_pio_sketches <board> <options> <examples-
         || [ -f "$sketchdir/.test.skip" ]; then
             continue
         fi
+        local sketchBuildFlags=""
+        if [ -f "$sketchdir/.test.build_flags" ]; then
+            while read line; do
+                sketchBuildFlags="$sketchBuildFlags $line"
+            done < "$sketchdir/.test.build_flags"
+        fi                
         sketchnum=$(($sketchnum + 1))
         if [ "$sketchnum" -le "$start_index" ] \
         || [ "$sketchnum" -gt "$end_index" ]; then
             continue
         fi
-        build_pio_sketch "$board" "$options" "$sketch"
+        build_pio_sketch "$board" "$options" "$sketch" "$sketchBuildFlags"
         local result=$?
         if [ $result -ne 0 ]; then
             return $result