Add sql service account

[khanhtc1202]

What this PR does / why we need it:

Add sqlServiceAccount as helm values. It will be used to enable connect from PipeCD workload to GCP Cloud SQL using Cloud SQL Auth proxy.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[pipecd-bot]

Code coverage for golang is 32.08%. This pull request increases coverage by 0.01%.

File	Function	Base	Head	Diff
pkg/app/api/stagelogstore/filestore.go	stageLogFileStore.Get	95.45%	95.65%	+0.20%

[nghialv]

/lgtm

[nakabonne]

nit: cloudSQLServiceAccount? We're going to support the authentication for Amazon RDS, right?

[khanhtc1202]

We're going to support the authentication for Amazon RDS, right?

Well, this change is for authorization, not authentication. And I've not looked at Amazon RDS connect method yet, but basically, we only support authentication RDS by username/password as we do for now, this service account is specific for connect to GCP cloud SQL only 🙏
About the name change, I will adopt your suggestion since it would be better to clearly mention that this is only for cloud SQL as you said 🙆‍♀️

[khanhtc1202]

addressed by 48309ff 🙏

[nakabonne]

Thank you
/approve

[pipecd-bot]

This pull request is APPROVED by nakabonne.

Approvers can cancel the approval by writing /approve cancel in a comment. Any additional commits also will change this pull request to be not-approved.

[pipecd-bot]

Code coverage for golang is 32.08%. This pull request increases coverage by 0.01%.

File	Function	Base	Head	Diff
pkg/app/api/stagelogstore/filestore.go	stageLogFileStore.Get	95.45%	95.65%	+0.20%