add to test release as well

.github/workflows/test-release.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Install build deps
         run: |
           sudo apt-get update -qq
-          sudo apt-get install -y devscripts debhelper build-essential
+          sudo apt-get install -y devscripts debhelper build-essential dpkg-sig
 
       - name: Compute build version
         id: version
@@ -62,6 +62,23 @@ jobs:
           echo "=== Package contents ==="
           dpkg-deb --contents ../*.deb
 
+      - name: Import GPG key
+        if: env.GPG_PRIVATE_KEY != ''
+        env:
+          GPG_PRIVATE_KEY: ${{ secrets.GPG_PRIVATE_KEY }}
+        run: |
+          echo "$GPG_PRIVATE_KEY" | gpg --batch --import
+
+      - name: Sign deb package
+        if: env.GPG_PRIVATE_KEY != ''
+        env:
+          GPG_PRIVATE_KEY: ${{ secrets.GPG_PRIVATE_KEY }}
+          GPG_KEY_ID: ${{ secrets.GPG_KEY_ID }}
+        run: |
+          DEB=$(ls ../*.deb)
+          dpkg-sig --sign builder -k "$GPG_KEY_ID" --gpg-options "--batch" "$DEB"
+          dpkg-sig --verify "$DEB"
+
       - name: Collect deb artifacts
         id: collect
         run: |