Add changelog for 0.40.0-rc6

CHANGELOG.md

+## 0.40.0-rc6 (2024-11-11)
+
+### Added (3 changes)
+
+- [Support `warning_on_none_empty_plan` input in pipeline templates](https://gitlab.com/components/opentofu/-/commit/27a482a76e7ee35b94f8539a50ecdf325f8711cb) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/170))
+- [Support `warning_on_none_empty_plan` input in `plan` job.](https://gitlab.com/components/opentofu/-/commit/4065954e5f9cefe02dc526951efb28afc7e8b661) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/170))
+- [Pass `plan` input down from compound templates](https://gitlab.com/components/opentofu/-/commit/4005bfaa98b82c73fbadaff6428398f9a0af15d6) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/169))
+
+### Fixed (2 changes)
+
+- [Fix plan json generation if `warning_on_non_empty_plan` is `true` and plan is non-empty](https://gitlab.com/components/opentofu/-/commit/8f5b05bb1f05d965d5db71cb4044e441e1f55c94) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/178))
+- [Remove duplicate image digest from `apply` job](https://gitlab.com/components/opentofu/-/commit/bb9aa26fb93919518c08210d5b6e0550b6ff76d5) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/176))
+
+### Changed (2 changes)
+
+- [Rename `warning_on_none_empty_plan` to `warning_on_non_empty_plan`](https://gitlab.com/components/opentofu/-/commit/9336f64b232694ea91135b478bb8813ef47343e6) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/173))
+- [Change cache policy in `validate-plan*` templates to only push in `validate` job](https://gitlab.com/components/opentofu/-/commit/b16327a0bf10cd28e8a1bf7189aafab027cfa31c) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/172))
+
+### Removed (3 changes)
+
+- [Remove `auto_apply` and `auto_destroy` inputs](https://gitlab.com/components/opentofu/-/commit/cac07e055a2b039ce5943704c99bdb4798a63fb4) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/177))
+- [Remove unused cache setup in `fmt` job](https://gitlab.com/components/opentofu/-/commit/40694b5d73c3f52144784e9d38a75c07ca6bf342) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/172))
+- [Remove old OpenTofu versions](https://gitlab.com/components/opentofu/-/commit/0a106f377cf0cafaeaed7db71d9b2761a9ca33d2) ([merge request](https://gitlab.com/components/opentofu/-/merge_requests/171))
+
+### Development (1 change)
+
+- [This is a changelog test commit](https://gitlab.com/components/opentofu/-/commit/7cba70e7b82843b05bf4c5bfcb2e7260596e4d04)
+
 ## 0.40.0-rc5 (2024-11-06)
 
 ### Added (3 changes)