Use docker-login action

.gitea/workflows/build.yml

@@ -19,10 +19,12 @@ jobs:
       - name: Print repository name
         run: |
           echo "💡 The "${{ gitea.repository }}" repository has been cloned to the runner."
-      - name: Pass login information
-        run: |
-          mkdir -p $HOME/.docker
-          echo "${{ secrets.DOCKER_AUTH_CONFIG }}" | base64 -d > $HOME/.docker/config.json
+      - name: Login to container registry
+        uses: docker/login-action@v3
+        with:
+          registry: git.rtj.dev
+          username: ${{ secrets.USERNAME }}
+          password: ${{ secrets.PASSWORD }}
       - name: Build Docker Image
         run: |
           cd ${{ gitea.workspace }}