feat(trivy): add fallback 3rd party completion loader

Author: scop

completions/.gitignore

@@ -236,6 +236,7 @@
 /_terraform
 /tightvncviewer
 /tracepath6
+/_trivy
 /typeset
 /_upctl
 /_vacuum

completions/Makefile.am

@@ -786,6 +786,7 @@ CLEANFILES = \
 	_terraform \
 	tightvncviewer \
 	tracepath6 \
+	_trivy \
 	typeset \
 	_upctl \
 	_vacuum \
@@ -886,7 +887,7 @@ symlinks: $(DATA)
 	$(ss) gkrellm \
 		gkrellm2
 	$(ss) _golangci-lint \
-		_hugo _kn _op _sshi _upctl _vacuum
+		_hugo _kn _op _sshi _trivy _upctl _vacuum
 	$(ss) gpgv \
 		gpgv2
 	$(ss) gssdp-discover \