fix docker login

.github/workflows/build.yml

@@ -19,6 +19,12 @@ jobs:
         with:
           go-version: '^1.22.5'
       - run: go version
+      - name: Login to Package Registry
+        uses: docker/login-action@v2
+        with:
+          registry: git.wittern.io
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
       - name: Build the Docker image
         run: |
           go install github.com/a-h/templ/cmd/templ@latest