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.

.releaserc.json

@@ -27,10 +27,9 @@
       }
     ],
     [
-      "@semantic-release/git",
+      "@semantic-release/exec",
       {
-        "assets": ["CHANGELOG.md"],
-        "message": "chore(release): ${nextRelease.version} [skip ci]\n\n${nextRelease.notes}"
+        "successCmd": "echo ${nextRelease.version} > .release-version"
       }
     ],
     [