Macro build_environment_aws_credentials 

macro_rules! build_environment_aws_credentials {
    ($prefix:literal) => { ... };
    () => { ... };
}

Reads AWS credentials from the environment variables AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY at build time.

This is not the best way to encode AWS access, but it is included as a simple way to get started with calling AWS.

The credentials must be set in the environment at build time, something like

AWS_ACCESS_KEY_ID=$DEVELOPER_KEY_ID \
AWS_SECRET_ACCESS_KEY=$DEVELOPER_SECRET_KEY \
cargo build --target wasm32-wasip2 --release

If your build environment does not have the variables set, the key and secret will be UNSET. It is highly unlikely that this will work for calling AWS.

Examples:

---

Read from the normal environment variables

let credentials = build_environment_aws_credentials!();

---

Read from foo_AWS_ACCESS_KEY_ID and foo_AWS_SECRET_ACCESS_KEY

let credentials = build_environment_aws_credentials!("foo_");