Update health.yaml (#146)

To not fail on bots, where the directory was not present
diff --git a/.github/workflows/health.yaml b/.github/workflows/health.yaml
index 2e8d654..a80c30d 100644
--- a/.github/workflows/health.yaml
+++ b/.github/workflows/health.yaml
@@ -116,10 +116,10 @@
 
       - name: Save PR number
         run: |
-          echo ${{ github.event.number }} > current_repo/output/issueNumber
+          mkdir -p current_repo/output/ && echo ${{ github.event.number }} > current_repo/output/issueNumber
 
       - name: Upload folder with number and markdown
         uses: actions/upload-artifact@65d862660abb392b8c4a3d1195a2108db131dd05
         with:
           name: output
-          path: current_repo/output/
\ No newline at end of file
+          path: current_repo/output/