Add pull request trigger to build_test workflow

Run workflows on PRs code

Author: hecko

.github/workflows/build_test.yml

@@ -4,6 +4,9 @@ on:
   push:
     branches:
       - '**'
+  pull_request:
+    branches:
+      - '**'
 
 jobs:
   rpm_test_build:
@@ -39,4 +42,4 @@ jobs:
         run: docker build -t sems_deb12 -f Dockerfile-debian12 .
 
       - name: Build image based on Debian 13
-        run: docker build -t sems_deb13 -f Dockerfile-debian13 .
+        run: docker build -t sems_deb13 -f Dockerfile-debian13 .