Adjust build dir for tests and sketches

Author: me-no-dev

Diff for: .github/scripts/on-push.sh

@@ -2,6 +2,8 @@
 
 set -e
 
+export ARDUINO_BUILD_DIR="$HOME/.arduino/build.tmp"
+
 function build(){
     local target=$1
     local fqbn=$2

Diff for: .github/scripts/sketch_utils.sh

@@ -8,16 +8,20 @@ function build_sketch(){ # build_sketch <ide_path> <user_path> <fqbn> <path-to-i
     fi
 
     ARDUINO_CACHE_DIR="$HOME/.arduino/cache.tmp"
-    ARDUINO_BUILD_DIR="$HOME/.arduino/build.tmp"
+    if [ -z "$ARDUINO_BUILD_DIR" ]; then
+        build_dir="$(dirname $sketch)/build"
+    else
+        build_dir="$ARDUINO_BUILD_DIR"
+    fi
     local ide_path=$1
     local usr_path=$2
     local fqbn=$3
     local sketch=$4
     local xtra_opts=$5
     local win_opts=$6
 
-    rm -rf "$ARDUINO_BUILD_DIR"
-    mkdir -p "$ARDUINO_BUILD_DIR"
+    rm -rf "$build_dir"
+    mkdir -p "$build_dir"
     mkdir -p "$ARDUINO_CACHE_DIR"
     $ide_path/arduino-builder -compile -logger=human -core-api-version=10810 \
         -fqbn=$fqbn \
@@ -29,7 +33,7 @@ function build_sketch(){ # build_sketch <ide_path> <user_path> <fqbn> <path-to-i
         -hardware "$usr_path/hardware" \
         -libraries "$usr_path/libraries" \
         -build-cache "$ARDUINO_CACHE_DIR" \
-        -build-path "$ARDUINO_BUILD_DIR" \
+        -build-path "$build_dir" \
         $win_opts $xtra_opts "$sketch"
 }