how to debug why container is building for 12+ min

Question

```
[Region: us-west1]

=========================

Using Detected Dockerfile

=========================

context: f5641df22d5960decd299eca52cc46b8

#0 building with "default" instance using docker driver

#1 [internal] load build definition from Dockerfile

#1 transferring dockerfile:

#1 transferring dockerfile: 282B 0.1s done

#1 DONE 116.5s

#2 [internal] load metadata for docker.io/oven/bun:latest

#2 DONE 1.8s

#3 [internal] load .dockerignore

#3 transferring context:

#3 transferring context: 2B done

#3 DONE 422.7s

#4 [base 1/2] FROM docker.io/oven/bun:1@sha256:fe7a6e288d3c2403687682174b44b124337bcebbf7d763e49d1f8e2d98aec167

#4 CACHED

#5 [stage-1  1/10] FROM docker.io/oven/bun:latest@sha256:fe7a6e288d3c2403687682174b44b124337bcebbf7d763e49d1f8e2d98aec167

#5 DONE 0.0s

#6 [stage-1  2/10] WORKDIR /app

#6 CACHED

#7 [internal] load build context

```

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