simple-app-build-local example builds the same image twice

**What steps did you take:**
```
kbld -f examples/simple-app-build-local/build.yml
simple-app | starting build (using Docker): test/e2e/assets/simple-app -> kbld:rand-1652108946742255592-1387725203109-simple-app
simple-app | starting build (using Docker): test/e2e/assets/simple-app -> kbld:rand-1652108946743073128-10522560189175-simple-app
...
resolve | final: simple-app -> kbld:simple-app-sha256-d4ca5dac9eb3959e041a367997debe1d42a8a08d2a34a885d56b65910201a611
resolve | final: simple-app2 -> kbld:simple-app-sha256-d4ca5dac9eb3959e041a367997debe1d42a8a08d2a34a885d56b65910201a611
```

**What happened:**
It builds the same image twice

**What did you expect:**
It only builds the image once

**Anything else you would like to add:**
[Additional information that will assist in solving the issue.]

**Environment:**

- kbld version (use `kbld --version`): v0.33.0

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