Add setup_ubuntu.sh and openssl.conf to Docker image source-change detection

Both files are copied into the Docker image via ADD directives in the
Dockerfile, but were not listed in source-patterns.sh. This meant changes
to user creation logic in setup_ubuntu.sh or TLS configuration in
openssl.conf would not trigger Docker image rebuilds, leading to stale
cached images.

Author: dnotestein

scripts/ci-helpers/source-patterns.sh

@@ -24,7 +24,9 @@ contrib/
 Dockerfile
 cmake
 CMakeLists.txt
-.gitmodules"
+.gitmodules
+scripts/setup_ubuntu.sh
+scripts/openssl.conf"
 
 case "${1:-}" in
     --regex)