deps: update docker/login-action action to v4

.gitea/workflows/build.yml

@@ -18,7 +18,7 @@ jobs:
         - /var/run/docker.sock:/var/run/docker.sock
     steps:
       - uses: actions/checkout@v7
-      - uses: docker/login-action@v3
+      - uses: docker/login-action@v4
         with:
           registry: git.studiovita.li
           username: ${{ secrets.REGISTRY_USERNAME }}

backup/action.yml

@@ -1,13 +0,0 @@
-name: backup
-description: backup all postgres databases
-
-runs:
-  using: "composite"
-  steps:
-    - name: dump databases
-      shell: bash
-      run: |
-        docker ps
-
-    # - name: backup databases
-    #   run: |