CI updates

.github/workflows/weekly-ci-rt-checkers.yml

@@ -13,6 +13,7 @@ env:
 
 jobs:
   job-runtime-checkers: # uses cmake + make
+    if: github.repository_owner == 'upx'
     strategy:
       fail-fast: false
       matrix:
@@ -93,7 +94,7 @@ jobs:
           export upx_exe_runner="${{ matrix.qemu }}"
           env -C build/xtarget/clang-static/$release "$PWD"/misc/testsuite/upx_testsuite_1.sh
       - name: 'Run testsuite clang-static - Valgrind'
-        if: ${{ true }} # very slow
+        if: true # very slow
         run: |
           export upx_exe_runner="valgrind --error-exitcode=1 --quiet"
           # on current GitHub CI, takes about 30 minutes for release and 80 minutes for debug builds