chore: have GHA generate ARM64 image, add description to images

The box where githubs container website complains about a lack
a description is really big. Okay its not important.

.github/workflows/docker.yml

@@ -44,9 +44,11 @@ jobs:
               uses: docker/setup-buildx-action@v3
             - name: Docker meta
               id: meta
-              uses: docker/metadata-action@v3
+              uses: docker/metadata-action@v5
               with:
                   images: revoltchat/client, ghcr.io/revoltchat/client
+              env:
+                  DOCKER_METADATA_ANNOTATIONS_LEVELS: manifest,index
             - name: Login to DockerHub
               uses: docker/login-action@v1
               if: github.event_name != 'pull_request'
@@ -65,6 +67,7 @@ jobs:
               with:
                   context: .
                   push: ${{ github.event_name != 'pull_request' }}
-                  platforms: linux/amd64
+                  platforms: linux/amd64,linux/arm64
                   tags: ${{ steps.meta.outputs.tags }}
+                  annotations: ${{ steps.meta.outputs.annotations }}
                   labels: ${{ steps.meta.outputs.labels }}