chore: build on aspect workflows (#505)

Set up an Aspect Workflows pipeline to build rules_py.

---

### Changes are visible to end-users: no

### Test plan

- Manual testing; please provide instructions so we can reproduce:
Yeet

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Co-authored-by: Alex Eagle <[email protected]>

Author: kormide

.aspect/workflows/config.yaml

@@ -0,0 +1,7 @@
+# See https://docs.aspect.build/workflows/configuration
+tasks:
+  - test:
+  - finalization:
+      queue: aspect-small
+notifications:
+  github: {}