chore: remove depot (#10343)

# Which Problems Are Solved

We hit a rate limit for our current plan at Depot
https://github.com/zitadel/zitadel/actions/runs/16589101600/job/46920267954?pr=10342.

# How the Problems Are Solved

Let's remove Depot for now, make things work and then optimize with
caching.

---------

Co-authored-by: Copilot <[email protected]>

.github/workflows/login-container.yml

@@ -14,9 +14,6 @@ on:
       login_build_image:
           description: 'The full image tag of the standalone login image'
           value: '${{ inputs.login_build_image_name }}:${{ github.sha }}'
-    secrets:
-      DEPOT_TOKEN:
-        required: true
 
 permissions:
   packages: write
@@ -35,7 +32,6 @@ jobs:
       packages: write
     steps:
       - uses: actions/checkout@v4
-      - uses: depot/setup-action@v1
       - name: Login meta
         id: login-meta
         uses: docker/metadata-action@v5
@@ -52,17 +48,17 @@ jobs:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
       - name: Bake login multi-arch
-        uses: depot/bake-action@v1
+        uses: docker/bake-action@v6
         env:
-          DEPOT_TOKEN: ${{ secrets.DEPOT_TOKEN }}
           NODE_VERSION: ${{ inputs.node_version }}
         with:
           push: true
           provenance: true
           sbom: true
           targets: login-standalone
-          project: w47wkxzdtw
           files: |
             ./apps/login/docker-bake.hcl
             ./apps/login/docker-bake-release.hcl