fix: switch OTA delivery to direct attached artifacts

.gitea/workflows/ota-build.yml

@@ -36,19 +36,20 @@ jobs:
           timestamp="$(date -u +%Y-%m-%dT%H-%M-%SZ)"
           mkdir -p dist/ota
           found=0
-          for fw in .pio/build/*/firmware.bin; do
+          for fw in .pio/build/*/firmware.bin .pio/build/*/firmware.hex; do
             [ -f "$fw" ] || continue
             env_name="$(basename "$(dirname "$fw")")"
-            cp "$fw" "dist/ota/${project_name}_${env_name}_${timestamp}.bin"
+            ext="${fw##*.}"
+            cp "$fw" "dist/ota/${project_name}_${env_name}_${timestamp}.${ext}"
             found=1
           done
           if [ "$found" -eq 0 ]; then
-            echo 'No firmware.bin artifacts were produced.' >&2
+            echo 'No firmware.bin or firmware.hex artifacts were produced.' >&2
             exit 1
           fi
           find dist/ota -maxdepth 1 -type f | sort
 
-      - name: Upload direct OTA files
+      - name: Upload direct OTA files as artifacts
         uses: actions/upload-artifact@v7
         with:
           name: ota-files