[doc] Add docs of required IAM actions for Piped

[t-kikuc]

What this PR does / why we need it:

as title.

Currently, it's difficult to specify which actions are necessary for deployments.

Which issue(s) this PR fixes:

Fixes #4793

Does this PR introduce a user-facing change?: N/A

• How are users affected by this change: N/A
• Is this breaking change:N/A
• How to migrate (if breaking change):N/A

How I listed

by the following commands.
List API calls -> Extract API names -> Remove duplicated

## Lambda
cat pkg/app/piped/platformprovider/lambda/client.go| grep '= c.client.' |  awk -F'.' '{print $3}' | awk -F'(' '{print $1}' | sort | uniq
## ECS>ECS
cat pkg/app/piped/platformprovider/ecs/client.go| grep '= c.ecsClient.' |  awk -F'.' '{print $3}' | awk -F'(' '{print $1}' | sort | uniq
## ECS>ELB
cat pkg/app/piped/platformprovider/ecs/client.go| grep '= c.elbClient.' |  awk -F'.' '{print $3}' | awk -F'(' '{print $1}' | sort | uniq

[ffjlabo]

@t-kikuc Thank you for the improvement. I left some comments.

[ffjlabo]

[ask] I am not familiar with AWS IAM, so I have a question. Is the IAM in AWS based on the API call? I'm concerned about whether other required permission exists. 👀

[t-kikuc]

Thanks, I forgot to list permissions that are required along with ECS/ELB/Lambda APIs.
I'll add them

[t-kikuc]

@ffjlabo
I fixed and added the following action.

         {
            "Effect": "Allow",
            "Action": [
                "iam:PassRole"
            ],
            "Resource": [
                "arn:aws:iam::<account-id>:role/<task-execution-role>",
                "arn:aws:iam::<account-id>:role/<task-role>"
            ]
        }

[ffjlabo]

[imo] How about moving to the installation section? It might be nice for users to know the requirements when installing.
https://pipecd.dev/docs-v0.47.x/installation/install-piped/

[t-kikuc]

Sounds great, thank you!

[t-kikuc]

i fixed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.30%. Comparing base (2c067bc) to head (1cac68f).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4925      +/-   ##
==========================================
- Coverage   29.32%   29.30%   -0.02%     
==========================================
  Files         321      321              
  Lines       40835    40835              
==========================================
- Hits        11974    11968       -6     
- Misses      27904    27910       +6     
  Partials      957      957              

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[khanhtc1202]

Nice catch, thanks 👍

[ffjlabo]

🚀