API returns code 403 when accessing pipeline schedule variables with a project access token.
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### Summary
API returns code 403 when accessing pipeline schedule variables with a project access token.
### Steps to reproduce
1. Create a project and note its project_id
1. Add some form of CI
1. Create a schedule and note its schedule_id
1. Create a project access token with scope "api".
1. Try to create/update/delete a pipeline schedule variable following the examples of https://docs.gitlab.com/ee/api/pipeline_schedules.html#pipeline-schedule-variables, using your freshly generated project access token for <your_access_token>, your API URL, your project-id and your pipeline_schedule_id.
### Example Project
Try the examples in https://docs.gitlab.com/ee/api/pipeline_schedules.html#pipeline-schedule-variables with a project access token.
### What is the current *bug* behavior?
* If I use the above mentioned project access token, the API call returns `{"message":"403 Forbidden"}`
* If I use a user's access token with scope "api", the API call returns 200 OK.
Not sure if it is an expected limitation though.
### What is the expected *correct* behavior?
When using a project access token, the API call shall create/update/delete the schedule variable and return 200 (OK)
#### More details
* API to update a project variable
* `curl --request PUT --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/1/variables/MY_VARIABLE" --form "value=updated value"`
* works with either a project access token and a personal access token.
* API for to update a pipeline schedule variable
* `curl --request PUT --header "PRIVATE-TOKEN: <your_access_token>" --form "value=updated value" "https://gitlab.example.com/api/v4/projects/29/pipeline_schedules/13/variables/MY_VARIABLE"`
* works with a personal access token
* **does not work with a project access token**
#### Results of GitLab environment info
Gitlab deployed as docker container on private infrastructure.
<details>
<summary>Expand for output related to the GitLab environment info</summary>
<pre>
System information
System:
Current User: git
Using RVM: no
Ruby Version: 2.7.5p203
Gem Version: 3.1.4
Bundler Version:2.3.15
Rake Version: 13.0.6
Redis Version: 6.2.7
Sidekiq Version:6.4.0
Go Version: unknown
GitLab information
Version: 15.2.2
Revision: 4ecb014a935
Directory: /opt/gitlab/embedded/service/gitlab-rails
DB Adapter: PostgreSQL
DB Version: 14.2
URL: https://BASE_URL
HTTP Clone URL: https://BASE_URL/some-group/some-project.git
SSH Clone URL: ssh://BASE_URL/some-group/some-project.git
Using LDAP: no
Using Omniauth: yes
Omniauth Providers: openid_connect
GitLab Shell
Version: 14.9.0
Repository storage paths:
- default: /var/opt/gitlab/git-data/repositories
GitLab Shell path: /opt/gitlab/embedded/service/gitlab-shell
</pre>
</details>
#### Results of GitLab application Check
<!-- Input any relevant GitLab application check information if needed. -->
<details>
<summary>Expand for output related to the GitLab application check</summary>
<pre>
Checking GitLab subtasks ...
Checking GitLab Shell ...
GitLab Shell: ... GitLab Shell version >= 14.9.0 ? ... OK (14.9.0)
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Internal API available: OK
Redis available via internal API: OK
gitlab-shell self-check successful
Checking GitLab Shell ... Finished
Checking Gitaly ...
Gitaly: ... default ... OK
Checking Gitaly ... Finished
Checking Sidekiq ...
Sidekiq: ... Running? ... yes
Number of Sidekiq processes (cluster/worker) ... 1/1
Checking Sidekiq ... Finished
Checking Incoming Email ...
Incoming Email: ... Reply by email is disabled in config/gitlab.yml
Checking Incoming Email ... Finished
Checking LDAP ...
LDAP: ... LDAP is disabled in config/gitlab.yml
Checking LDAP ... Finished
Checking GitLab App ...
Database config exists? ... yes
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory exists? ... yes
Uploads directory has correct permissions? ... yes
Uploads directory tmp has correct permissions? ... yes
Systemd unit files or init script exist? ... skipped (omnibus-gitlab has neither init script nor systemd units)
Systemd unit files or init script up-to-date? ... skipped (omnibus-gitlab has neither init script nor systemd units)
Projects have namespace: ...
2/1 ... yes
7/4 ... yes
7/5 ... yes
61/6 ... yes
7/7 ... yes
7/8 ... yes
7/9 ... yes
7/10 ... yes
30/11 ... yes
30/12 ... yes
30/13 ... yes
61/15 ... yes
7/16 ... yes
7/17 ... yes
49/18 ... yes
49/19 ... yes
62/20 ... yes
62/21 ... yes
62/22 ... yes
66/23 ... yes
67/24 ... yes
70/25 ... yes
61/26 ... yes
67/27 ... yes
70/28 ... yes
Redis version >= 6.0.0? ... yes
Ruby version >= 2.7.2 ? ... yes (2.7.5)
Git user has default SSH configuration? ... yes
Active users: ... 33
Is authorized keys file accessible? ... yes
GitLab configured to store new projects in hashed storage? ... yes
All projects are in hashed storage? ... yes
Checking GitLab App ... Finished
Checking GitLab subtasks ... Finished
</pre>
</details>
### Possible fixes
No idea.
issue
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