feat(action): we've verified the file exists from the output of the last step so lets make a predictable error by string to use it next

.forgejo/workflows/demo.yaml

@@ -16,6 +16,8 @@ jobs:
       # idk just show me what the fuck exists
       - name: list directory contents
         run: ls ./.forgejo/dotnet-build -la
+      - name: why not use the action we just verified exists from above
+        uses: ./.forgejo/dotnet-build
       # - id: dotnet-build
       #   uses: ./.forgejo/dotnet-build/action.yml'
       #   # with: