ci: Avoid invoking curl on the host

Author: MarcoFalke

ci/test/05_before_script.sh

@@ -19,7 +19,7 @@ OSX_SDK_BASENAME="Xcode-${XCODE_VERSION}-${XCODE_BUILD_ID}-extracted-SDK-with-li
 OSX_SDK_PATH="${DEPENDS_DIR}/sdk-sources/${OSX_SDK_BASENAME}"
 
 if [ -n "$XCODE_VERSION" ] && [ ! -f "$OSX_SDK_PATH" ]; then
-  curl --location --fail "${SDK_URL}/${OSX_SDK_BASENAME}" -o "$OSX_SDK_PATH"
+  DOCKER_EXEC curl --location --fail "${SDK_URL}/${OSX_SDK_BASENAME}" -o "$OSX_SDK_PATH"
 fi
 
 if [[ ${USE_MEMORY_SANITIZER} == "true" ]]; then