Update main.workflow

.github/main.workflow

@@ -13,6 +13,7 @@ action "branch-filter" {
   args = "tag v*"
 }
 
+# only release on `v*` tags
 action "release" {
   needs = ["branch-filter"]
   uses = "docker://goreleaser/goreleaser:v0.97"
@@ -25,4 +26,4 @@ action "build" {
   uses = "docker://goreleaser/goreleaser:v0.97"
   args = "--snapshot --rm-dist"
   secrets = ["SNAPSHOT_VERSION"]
-}
+}