Changing directories in Cloud Build 'cd' no found - google-cloud-build

Question

I'm using cloud build to clone a repository. I can confirm the repository clones successfully to the cloud build /workspace volume.
steps:
- id: 'Clone repository'
name: 'gcr.io/cloud-builders/git'
args: ['clone', $_REPO_URL]
volumes:
- name: 'ssh'
path: /root/.ssh
I then run the next step to confirm
- id: 'List'
name: 'alpine'
args: ['ls']
and it shows me the repository is in the current directory. But when I try and cd into the directory the cd command doesn't work and throws an error:
ERROR: build step 3 "alpine" failed: starting step container failed: Error response from daemon: OCI runtime create failed: container_linux.go:380: starting container process caused: exec: "cd <repo-name>": executable file not found in $PATH: unknown
My ultimate goal is to cd into the repository and run some git commands. I use alpine later on because the git builder image doesn't allow me to use cd either.
substitutions:
_REPO_NAME: 'test-repo'
_REPO_URL: 'git#bitbucket.org:example/test-repo.git'
_BRANCH_NAME: 'feature/something'
steps:
- id: 'Clone repository'
name: 'gcr.io/cloud-builders/git'
args: ['clone', $_REPO_URL]
volumes:
- name: 'ssh'
path: /root/.ssh
- id: 'Check Diff'
name: 'alpine'
args: ['cd $_REPO_NAME', '&&', 'git checkout $_BRANCH_NAME', '&&', 'git diff main --name-only']

Answer 1

You can use bash to run any commands you would like.
Here is one example I use for one of my projects:
- name: 'gcr.io/cloud-builders/git'
id: Clone env repository
entrypoint: /bin/sh
args:
- '-c'
- |
git clone git#github.com:xyz/abc.git && \
cd gitops-env-repo/ && \
git checkout dev

Answer 2

Use dir field in your *.yaml file.
steps:
- name: string
args: [string, string, ...]
env: [string, string, ...]
dir: string
id: string
waitFor: [string, string, ...]
entrypoint: string
secretEnv: string
volumes: object(Volume)
timeout: string (Duration format)
- name: string
...
- name: string
...
timeout: string (Duration format)
queueTtl: string (Duration format)
logsBucket: string
options:
env: [string, string, ...]
secretEnv: string
volumes: object(Volume)
sourceProvenanceHash: enum(HashType)
machineType: enum(MachineType)
diskSizeGb: string (int64 format)
substitutionOption: enum(SubstitutionOption)
dynamicSubstitutions: boolean
logStreamingOption: enum(LogStreamingOption)
logging: enum(LoggingMode)
pool: object(PoolOption)
substitutions: map (key: string, value: string)
tags: [string, string, ...]
serviceAccount: string
secrets: object(Secret)
availableSecrets: object(Secrets)
artifacts: object (Artifacts)
images:
- [string, string, ...]
https://cloud.google.com/build/docs/build-config-file-schema