Docs: Add IAM permissions in Idempotency

[heitorlessa]

What were you searching in the docs?

As described by @mattyweb in #1772 (comment):

---

Just found this thread and upgraded to the new PowerTools in order to troubleshoot. Trying an idempotent lambda in python and this was my first time using DynamoDB.

Had to add the following actions to my lambda config:
"Action": [
"dynamodb:GetItem",
"dynamodb:PutItem",
"dynamodb:UpdateItem",
"dynamodb:DeleteItem"
],

Don't know how I would have figured this out otherwise. Might be good to add this to the PowerTools Idempotency docs! (Unless I just missed it!)

---

Is this related to an existing documentation section?

https://awslabs.github.io/aws-lambda-powertools-python/2.7.1/utilities/idempotency/

How can we improve?

Add a dedicated section to IAM similar to other places like Parameters: https://awslabs.github.io/aws-lambda-powertools-python/2.7.1/utilities/parameters/#iam-permissions

Got a suggestion in mind?

No response

Acknowledgment

• I understand the final update might be different from my proposed suggestion, or refused.

[leandrodamascena]

How can we improve?

Add a dedicated section to IAM similar to other places like Parameters: awslabs.github.io/aws-lambda-powertools-python/2.7.1/utilities/parameters/#iam-permissions

This is a good example, but I don't think we need to create a table for this, because we only have one resource: DynamoDB. We could do what we did here https://awslabs.github.io/aws-lambda-powertools-python/2.7.1/utilities/feature_flags/#iam-permissions.

Could be something like this:

[heitorlessa]

Agree. We can expand when #1181 completes or when we add additional providers. Let's wait by EOD (Central European Time - CET) to hear whether @mattyweb would like to make his first contribution with our help, OR decide to go ahead with the change and credit Matt for spotting it (crediting should happen either way).

[heitorlessa]

Now live! Closing: https://awslabs.github.io/aws-lambda-powertools-python/2.7.1/utilities/idempotency/#iam-permissions

[github-actions]

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[github-actions]

This is now released under 2.8.0 version!