CI: specify the programming language for Coverity

Commit 2a9ee59 fixed the CI failure.
Nevertheless the Coverity service still sends failure notifications
about incomplete capture.  Explicitly specify the programming language
to eliminate these failure notifications.

Related: #207

Author: kdudka

.github/workflows/coverity.yml

@@ -3,7 +3,9 @@ name: Coverity
 
 on:
   push:
-    branches: [main]
+    branches:
+      - coverity
+      - main
 
 jobs:
   coverity:
@@ -26,4 +28,4 @@ jobs:
           # The GitHub Action this workflow is based on uses `cov-build`, which
           # does not support buildless capture any more.  This way we make it
           # use `coverity capture` instead of `cov-build`.
-          command: --ident; set -x; coverity --ticker-mode=no-spin capture --dir=cov-int --file-include-regex="csmock|scripts"
+          command: --ident; set -x; coverity --ticker-mode=no-spin capture --dir=cov-int --file-include-regex="csmock|scripts" --language=python