ci: fit the artifact push timeout to full image uploads (#1216)

Author: ahmedadan

.github/workflows/build.yml

@@ -148,7 +148,7 @@ jobs:
           BST_FLAGS: -o x86_64_v3 false --no-interactive --config /src/buildstream-push.conf
         run: |
           just bst artifact push --deps run ${{ matrix.element }}
-        timeout-minutes: 30
+        timeout-minutes: 120
 
       - name: Upload build logs
         if: always()