docs: add release notes for v1.0.4

Author: github-actions[bot]

release_notes/v1.0.4.md

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+## [1.0.4](https://github.com/NHSDigital/eps-devcontainers/compare/v1.0.3...v1.0.4) (2026-02-18)
+
+
+### Chore
+
+* [AEA-0000] - delete old images fix (#19) ([242823d](https://github.com/NHSDigital/eps-devcontainers/commit/242823d43bf31ae94106e907e3604fa25cd8dca3))
+* [AEA-0000] - various fixes (#20) ([a68181c](https://github.com/NHSDigital/eps-devcontainers/commit/a68181c543c3ff107206fe2fa09ecbed3db60c41))
+
+
+
+
+## Info
+[Release workflow run](https://github.com/NHSDigital/eps-devcontainers/actions/runs/22135180096) - Workflow ID: 22135180096
+
+It was initialized by [anthony-nhs](https://github.com/anthony-nhs)
+
+