ci: make dev GHCR publish single-arch and bounded

Use linux/amd64-only publishing for dev stream and add job timeout to avoid prolonged multi-arch hangs while keeping prod DockerHub workflow unchanged.

Author: bvt123

.github/workflows/docker-dev-ghcr.yml

@@ -13,6 +13,7 @@ env:
 jobs:
   build:
     runs-on: ubuntu-latest
+    timeout-minutes: 45
     permissions:
       contents: read
       packages: write
@@ -55,7 +56,7 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           context: .
-          platforms: linux/amd64,linux/arm64
+          platforms: linux/amd64
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}