ci: fix build pipeline

Add missing code which was removed by accident

Author: jangalda-nsc

.github/workflows/build-using-toolchain-bundle.yml

@@ -2,6 +2,9 @@ name: Build and test app in toolchain bundle environment
 
 on:
   pull_request:
+  push:
+    branches:
+      - fix-workflow
 
 jobs:
   build-and-test-in-toolchain-bundle:
@@ -47,6 +50,7 @@ jobs:
           key: ${{steps.set-tb-id.outputs.TOOLCHAIN_BUNDLE_NAME}}
 
       - name: Install proper toolchain bundle
+        run: ./nrfutil toolchain-manager install --toolchain-bundle ${{steps.set-tb-id.outputs.TOOLCHAIN_BUNDLE_NAME}}
 
       - name: Build firmware
         run: |