Don't swallow asdf install terraform failure

Author: stevebux

.github/actions/lint-terraform/action.yaml

@@ -11,7 +11,8 @@ runs:
       shell: bash
       run: |
         asdf plugin add terraform || true
-        asdf install terraform || true
+        asdf install terraform
+        asdf current terraform
     - name: "Check Terraform format"
       shell: bash
       run: |