Add support for AWS IRSA env variables

Author: kahirokunn

Changelog.md

@@ -6,6 +6,7 @@ adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 ### Added
+ * If you want to save mysql backup to AWS S3, `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY` were the only options, but now you can use `AWS_SESSION_TOKEN` or `AWS_ROLE_ARN` and `AWS_WEB_IDENTITY_TOKEN_FILE`
 ### Changed
  * Update rclone to `v1.57.0`
 ### Removed

images/mysql-operator-sidecar-5.7/rootfs/usr/local/bin/docker-entrypoint.sh

@@ -16,7 +16,7 @@ impersonate = ${GDRIVE_IMPERSONATOR}
 
 [s3]
 type = s3
-env_auth = false
+env_auth = true
 provider = ${S3_PROVIDER:-"AWS"}
 access_key_id = ${AWS_ACCESS_KEY_ID}
 secret_access_key = ${AWS_SECRET_ACCESS_KEY:-$AWS_SECRET_KEY}