fix: filter link and volume flags for dockerfile builds

The link flag was previously not filtered _after_ fetching build args for dockerfile builds, which meant if a plugin exposed that in it's own docker-args-build trigger, it would break deploys.

Additionally, allow for whitespaces between link and volume flags.

plugins/docker-options/docker-args-deploy

@@ -42,7 +42,7 @@ trigger-docker-options-docker-args() {
           case "$IMAGE_SOURCE_TYPE" in
             dockerfile)
               case "$line" in
-                --link* | -v*)
+                --link* | -v* | --volume*)
                   continue
                   ;;