chore: set compatible architecture for published extension layers

[trentm]

Closes: #141

Checklist

• Test this (see test note at publish: make a layer public #116)

[ghost]

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• Start Time: 2022-03-05T01:00:06.775+0000

• Duration: 7 min 23 sec

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Total	90

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[trentm]

Tested via:

% ELASTIC_LAYER_NAME=trentm-test-elastic-apm-extension make build-and-publish
GOARCH=amd64 make build
GOOS=linux go build -o bin/extensions/apm-lambda-extension main.go
chmod +x bin/extensions/apm-lambda-extension
GOARCH=amd64 make zip
cd bin && rm -f extension.zip || true && zip -r extension.zip extensions && cp extension.zip amd64.zip
  adding: extensions/ (stored 0%)
  adding: extensions/apm-lambda-extension (deflated 47%)
/Applications/Xcode.app/Contents/Developer/usr/bin/make publish
{
    "Content": {
        "Location": "https://awslambda-us-west-2-layers.s3.us-west-2.amazonaws.com/snapshots/627286350134/trentm-test-elastic-apm-extension-x86_64-cd6...",
        "CodeSha256": "4BIzlFiYmhP5DJh54NPAqENE4CECYFv3oxxK15KxICY=",
        "CodeSize": 3841979
    },
    "LayerArn": "arn:aws:lambda:us-west-2:627286350134:layer:trentm-test-elastic-apm-extension-x86_64",
    "LayerVersionArn": "arn:aws:lambda:us-west-2:627286350134:layer:trentm-test-elastic-apm-extension-x86_64:1",
    "Description": "AWS Lambda Extension Layer for Elastic APM x86_64",
    "CreatedDate": "2022-03-05T00:56:13.939+0000",
    "Version": 1,
    "LicenseInfo": "Apache-2.0",
    "CompatibleArchitectures": [
        "x86_64"
    ]
}

which now properly includes a "CompatibleArchitectures" value.

In the console this looks like:

Aside: The AWS Console doesn't actually warn at all if you attempt to add a layer with "Compatible architectures: x86_64" to a Lambda function with "Architecture: arm64". Not great, but not our issue. :)

[v1v]

Thanks :)

If needed, we could publish a new version with this fix for the same Release (if it makes any sense) those ARNs will be bumped

[trentm]

If needed, we could publish a new version with this fix for the same Release (if it makes any sense)

No need. We want a new version release with #132 when that goes in (hopefully soon), anyway.