Use `oncreate.sh` scripts #169

Job	Run time
test-global	10s
detect-changes	4s
test-scenarios (aws-cli-persistence)	1m 57s
test-autogenerated (aws-cli-persistence, debian:latest)	42s
test-scenarios (gcloud-cli-persistence)	5m 7s
test-autogenerated (aws-cli-persistence, ubuntu:latest)	13s
test-scenarios (terraform-cli-persistence)	2m 20s
test-autogenerated (aws-cli-persistence, mcr.microsoft.com/devcontainers/base:ubuntu)	29s
test-scenarios (mount-pnpm-store)	2m 49s
test-autogenerated (gcloud-cli-persistence, debian:latest)	21s
test-scenarios (github-cli-persistence)	1m 59s
test-autogenerated (gcloud-cli-persistence, ubuntu:latest)	15s
test-autogenerated (gcloud-cli-persistence, mcr.microsoft.com/devcontainers/base:ubuntu)	19s
test-autogenerated (terraform-cli-persistence, debian:latest)	17s
test-autogenerated (terraform-cli-persistence, ubuntu:latest)	21s
test-autogenerated (terraform-cli-persistence, mcr.microsoft.com/devcontainers/base:ubuntu)	33s
test-autogenerated (mount-pnpm-store, debian:latest)	14s
test-autogenerated (mount-pnpm-store, ubuntu:latest)	19s
test-autogenerated (mount-pnpm-store, mcr.microsoft.com/devcontainers/base:ubuntu)	26s
test-autogenerated (github-cli-persistence, debian:latest)	11s
test-autogenerated (github-cli-persistence, ubuntu:latest)	8s
test-autogenerated (github-cli-persistence, mcr.microsoft.com/devcontainers/base:ubuntu)	25s
	19m 39s

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