remove registry login step from CI pipelines

Runner is already authenticated via docker login on the host.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/docker-build.yml

@@ -9,12 +9,6 @@ jobs:
     name: 🏗️ Docker builder (latest from master) 🏗️
     runs-on: dind
     steps:
-      - name: "[docker] registry login"
-        uses: docker/login-action@v2
-        with:
-          registry: git.cynarski.pl
-          username: ${{ secrets.REGISTRY_USER }}
-          password: ${{ secrets.REGISTRY_PASSWORD }}
       - name: "[code] repository checkout"
         uses: actions/checkout@v3
         with:

.gitea/workflows/docker-tag.yml

@@ -9,12 +9,6 @@ jobs:
     name: 🏗️ Docker builder release tag 🏗️
     runs-on: dind
     steps:
-      - name: "[docker] registry login"
-        uses: docker/login-action@v2
-        with:
-          registry: git.cynarski.pl
-          username: ${{ secrets.REGISTRY_USER }}
-          password: ${{ secrets.REGISTRY_PASSWORD }}
       - name: "[code] repository checkout"
         uses: actions/checkout@v3
         with: