echo $TAG_NAME in Action (#421)

Just to be able to see on logs what version it has actually resolved to.

Because of
#419 (comment).

Author: vorburger

action.yaml

@@ -39,6 +39,7 @@ runs:
         else
           TAG_NAME=$TAG_PATTERN
         fi
+        echo $TAG_NAME
         gh release download $TAG_NAME --pattern bazel-steward.jar --repo $REPOSITORY
       env:
         GH_TOKEN: ${{ github.token }}