Fix S3 metrics test to actually test the correct code path #8

	on:
	pull_request:
	branches:
	- main
	push:
	branches:
	- main

	jobs:
	test:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Set up Go
	uses: actions/setup-go@v5
	with:
	go-version: 1.22
	- name: Start LocalStack
	uses: LocalStack/[email protected]
	with:
	image-tag: 'latest'
	install-awslocal: 'true'
	- name: Run tests
	run: go test -v ./...
	env:
	# localstack requires these environment variables
	AWS_DEFAULT_REGION: ap-northeast-1
	# Credentials are important for localstack
	# Without them, the tests will fail like:
	# operation error S3: CreateBucket, get identity: get credentials: failed to refresh cached credentials, no EC2 IMDS role found, operation error ec2imds: GetMetadata, failed to get API token, operation error ec2imds: getToken, http response error StatusCode: 400, request to EC2 IMDS failed
	AWS_ACCESS_KEY_ID: test
	AWS_SECRET_ACCESS_KEY: test
	# These environment variables are required by main and main_test
	# Without them, the tests will fail like:
	# operation error S3: CreateBucket, exceeded maximum number of attempts, 3, https response error StatusCode: 500, RequestID: 346f5995-bbe8-41e2-be03-3a6ab0ad5edd, HostID: s9lzHYrFp76ZVxRcpX9+5cjAnEH2ROuNkd2BHfIa6UkFVdtjf5mKR3/eTPFvsiP/XV/VLi31234=, api error InternalError: exception while calling s3 with unknown operation: Unable to find operation for request to service s3: PUT /
	S3_BUCKET: mybucket
	S3_KEY: mykey

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