[CI] Add branch context to the Coverity

Since this PR Coverity can also be executed
for another branch. Previous solutions always
cloned the main branch.

Author: KFilipek

.github/workflows/coverity.yml

@@ -22,6 +22,8 @@ jobs:
     steps:
     - name: Checkout repository
       uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      with: 
+        ref: ${{ github.ref }}
 
     - name: Install apt packages
       run: |