ci: fix registry auth and bump obikmer to 1.1.30

Update the release workflow to explicitly resolve the Docker registry username from repository secrets instead of inferring it from the runner's actor. Bump the obikmer package version to 1.1.30.

.gitea/workflows/release.yml

@@ -90,7 +90,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Login to registry
-        run: echo "${{ secrets.REGISTRYTOKEN }}" | docker login registry.metabarcoding.org -u ${{ github.actor }} --password-stdin
+        run: echo "${{ secrets.REGISTRYTOKEN }}" | docker login registry.metabarcoding.org -u ${{ secrets.REGISTRYUSER }} --password-stdin
 
       - name: Cache cargo registry
         uses: actions/cache@v4