Fix: Only call docker rmi if there are images to prune (TeslaGov#85)

* fix(scripts.sh): only call `docker rmi` if there are images to prune

* fix(docker-rmi): always return true after calling `docker rmi`

Author: SmartArray

scripts.sh

@@ -40,7 +40,7 @@ build_nginx() {
 		printf "${GREEN}✓ Successfully built NGINX module ${NC}"
 	fi
 
-	docker rmi -f $(docker images --filter=label=stage=builder --quiet)
+	docker rmi -f $(docker images --filter=label=stage=builder --quiet) || true
 }
 
 rebuild_nginx() {
@@ -92,4 +92,4 @@ test() {
 
 for fn in $@; do
 	"$fn"
-done
+done