chore: update CI workflow and release process

- Replaced `@semantic-release/git` with `@semantic-release/exec` for handling release commands.
- Updated `.releaserc.json` to reflect changes in release command execution.
- Modified CI workflow to streamline the release process, including tagging and Docker image publishing.
- Removed obsolete publish workflow and integrated its functionality into the main CI workflow.
- Enhanced documentation to clarify the new release process and CI pipeline structure.

package.json

@@ -7,7 +7,7 @@
     "@markwylde/semantic-release-gitea": "^2.2.0",
     "@semantic-release/changelog": "^6.0.3",
     "@semantic-release/commit-analyzer": "^13.0.1",
-    "@semantic-release/git": "^10.0.1",
+    "@semantic-release/exec": "^7.0.0",
     "@semantic-release/release-notes-generator": "^14.0.3",
     "semantic-release": "^25.0.2"
   }