Update nix version in cicd

.github/workflows/cicd.yml

@@ -110,6 +110,15 @@ jobs:
             exit 1
           fi
 
+      - name: Update version in flake.nix
+        shell: bash
+        env:
+          VERSION: ${{ inputs.version }}
+        run: |
+          set -euo pipefail
+          sed -i "s/version = \"[0-9]*\.[0-9]*\.[0-9]*\(-rc\.[0-9]*\)\?\"/version = \"$VERSION\"/" flake.nix
+          echo "Updated flake.nix version to $VERSION"
+
       - name: Create and push tag
         shell: bash
         env:
@@ -127,6 +136,11 @@ jobs:
             echo "Tag $VERSION already exists" >&2
             exit 1
           fi
+          if ! git diff --quiet flake.nix; then
+            git add flake.nix
+            git commit -m "chore(nix): update version to $VERSION"
+            git push origin "$TARGET_BRANCH"
+          fi
           git tag -a "$VERSION" -m "Release $VERSION"
           git push origin "refs/tags/$VERSION"