Generate latest tag by default on push tag event (#5)

Co-authored-by: CrazyMax <crazy-max@users.noreply.github.com>

src/meta.ts

@@ -52,6 +52,8 @@ export class Meta {
           version.version = tagMatch[this.inputs.tagMatchGroup];
           version.latest = this.inputs.tagMatchLatest;
         }
+      } else {
+        version.latest = true;
       }
     } else if (/^refs\/heads\//.test(this.context.ref)) {
       version.version = this.context.ref.replace(/^refs\/heads\//g, '').replace(/\//g, '-');