Fix argument passing

The builder.docker-opts and builder.platform arguments didn't work.
The switch and its values were added to the builder_instance_args array
as a single element, but the switch should be one element and its values
the another. Otherwise it produces an invalid parameter when passed to
the docker commands and errors are thrown.

Author: jim-barber-he

hooks/pre-command

@@ -41,12 +41,12 @@ if [[ "${builder_create}" == "true" ]]; then
 
         driver_opt="$(plugin_read_config BUILDER_DRIVER_OPT "")"
         if [[ -n "${driver_opt}" ]]; then
-            builder_instance_args+=("--driver-opt ${driver_opt}")
+            builder_instance_args+=("--driver-opt" "${driver_opt}")
         fi
 
         builder_platform="$(plugin_read_config BUILDER_PLATFORM "")"
         if [[ -n "${builder_platform}" ]]; then
-            builder_instance_args+=("--platform ${builder_platform}")
+            builder_instance_args+=("--platform" "${builder_platform}")
         fi
 
         remote_address="$(plugin_read_config BUILDER_REMOTE_ADDRESS "")"