build.yml: Fix No files were found with the provided path

Fix

Warning: No files were found with the provided path: buildartifacts/.

Signed-off-by: simbit18 <simbit18@gmail.com>

Author: simbit18

.github/workflows/build.yml

@@ -181,17 +181,18 @@ jobs:
           BLOBDIR: /tools/blobs
         with:
           run: |
+            export ARTIFACTDIR=`pwd`/buildartifacts
+
             pip install ntfc==0.0.1
             mkdir /github/workspace/nuttx-ntfc
             mkdir /github/workspace/nuttx-ntfc/external
             cd /github/workspace/nuttx-ntfc
             # get NTFC test cases
             cd external
             git clone -b release-0.0.1 https://github.com/szafonimateusz-mi/nuttx-testing
+            export NTFCDIR=/github/workspace/nuttx-ntfc
 
             echo "::add-matcher::sources/nuttx/.github/gcc.json"
-            export ARTIFACTDIR=`pwd`/buildartifacts
-            export NTFCDIR=/github/workspace/nuttx-ntfc
             git config --global --add safe.directory /github/workspace/sources/nuttx
             git config --global --add safe.directory /github/workspace/sources/apps
             cd /github/workspace/sources/nuttx/tools/ci