chore(linux): Sign packages even if build for next Ubuntu fails

We want to run the `deb_signing` job after building binary packages for
both released and unreleased Ubuntu versions finished, so we have to
specify those in the `needs` field. But that on its own causes the
signing job to be skipped if the binary package build for the next
Ubuntu version fails. This change adds conditions so that the
`deb_signing` job always runs if source package build and the binary
package build for the released Ubuntu versions succeeds.

.github/workflows/deb-packaging.yml

@@ -194,7 +194,7 @@ jobs:
     needs: [sourcepackage, binary_packages_released, binary_packages_unreleased]
     runs-on: ubuntu-latest
     environment: "deploy (linux)"
-    if: github.event.client_payload.isTestBuild == 'false'
+    if: ${{always() && needs.sourcepackage.result == 'success' && needs.binary_packages_released.result == 'success' && github.event.client_payload.isTestBuild == 'false'}}
 
     steps:
       - name: Sign packages