Externalize auth, OpenTofu support, multi-cloud backends, Node.js 24 actions#1

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andypotanin wants to merge 7 commits into

Commits on May 2, 2026

Add generic state backend override inputs

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make GCP auth optional for AWS-only deployments
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externalize auth: remove GCP/AWS auth steps from action, caller handles auth
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update README for externalized auth, OpenTofu, and multi-cloud backends
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Bump actions/checkout to v5 and actions/upload-artifact to v5

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Bump actions/upload-artifact from v5 to v6 for Node.js 24

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Address PR review: add state_backend default, guard AWS vars

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