CI: set DEBIAN_FRONTEND=noninteractive in Coverity job

Author: lzaoral

.github/workflows/coverity.yml

@@ -6,7 +6,11 @@ on:
 jobs:
   coverity:
     name: Coverity Scan
+
     runs-on: ubuntu-latest
+    env:
+      DEBIAN_FRONTEND: noninteractive
+
     steps:
       - name: Checkout repository
         uses: actions/checkout@v3