Explicitly target glibc 2.26 for rust on Amazon Linux 2

[lewisl9029]

Hi there! I recently started running into errors like this for the rust lambda I have deployed through sst:

/var/task/bootstrap: /lib64/libc.so.6: version `GLIBC_2.28' not found (required by /var/task/bootstrap)

Did a bit of digging and it seems like this is because SST deploys rust functions to Amazon Linux 2, which only supports glibc 2.26: https://repost.aws/questions/QUrXOioL46RcCnFGyELJWKLw/glibc-2-27-on-amazon-linux-2

I suspect the target probably changed at some point seemingly randomly due to upgrades on the CI builder fleet?

So I've added a target flag in this PR to ensure we target glibc2.26 regardless of build environment.

I published this change (without the arm64 branch) in a separate package at https://www.npmjs.com/package/@lewisl9029/sst, gave it a try myself, and it seems to have resolved these errors. Please note that although I added an arm64 branch in the code, I've only tested this with an x86_64 lambda.

Looks like a few folks have had similar issues, so I figured I'd try to get this merged. :)

Cheers!

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[jayair]

Thanks! We'll take a look.

[henrycrib]

Another option is to update the rust runtime to CDKRuntime.PROVIDED_AL2023 which supports glibc 2.28; and IMO is more sensible because AL2 is quite old.

[henrycrib]

#3729

[thdxr]

i think bumping the amazon linux runtime should fix it