fix: Add fail_level to reviewdog actions

[michelabboud]

Description

The CI review workflow (review.yml) produces deprecation warnings on every PR:

Input 'fail_on_error' has been deprecated with message: Deprecated, use fail_level instead.

These are emitted by the 5 reviewdog actions that have migrated to fail_level (misspell, hadolint, yamllint, actionlint, shellcheck). The fail_on_error input was never set explicitly in the workflow — the warnings come from the actions' internal action.yml resolving the deprecated input to its default value.

Additionally, none of the reviewdog steps have failure thresholds configured, so linting errors don't actually fail the CI job.

Fix

• Add fail_level: error to the 5 actions that support it
• Use fail_on_error: "true" for action-shfmt (which hasn't added fail_level yet)

Reference

• reviewdog: -fail-on-error is deprecated. Use -fail-level=any, or -fail-level=error for github-[pr-]check reporter instead reviewdog/action-shellcheck#67

PR

#1638