Add fpm to PATH

.github/workflows/release.yml

@@ -33,6 +33,9 @@ jobs:
         sudo apt-get update
         sudo apt-get install -y ruby-full
         gem install fpm
+        export PATH="$(ruby -e 'puts Gem.user_dir')/bin:$PATH"
+    - name: Check fpm
+      run: which fpm
     - name: Build Debian package
       run: |
         mkdir -p build/linux/opt
@@ -57,6 +60,8 @@ jobs:
           --category internet \
           --version "${{github.ref_name#v}}" \
           --license GPLv3
+    - name: Check deb file
+      run: ls -la dist/
     - name: Upload artifact
       uses: actions/upload-artifact@v3
       with: