chore: use github for docker build layer caches (#10346)

# Which Problems Are Solved

Building the login container in the pipeline without build layer caches
takes about 20 minutes.

# How the Problems Are Solved

We use cache-from and cache-to arguments to use the GitHub cache API.
Compare 1st and 2nd run [of this PRs
pipeline](https://github.com/zitadel/zitadel/actions/runs/16590808510/job/46927893304)

# Additional Context

- Follows up on #10343

.github/workflows/login-container.yml

@@ -59,6 +59,9 @@ jobs:
           provenance: true
           sbom: true
           targets: login-standalone
+          set: |
+            *.cache-from=type=gha
+            *.cache-to=type=gha,mode=max
           files: |
             ./apps/login/docker-bake.hcl
             ./apps/login/docker-bake-release.hcl