chore: add ARM builds

Author: TheDevMinerTV

.github/workflows/ghcr.yml

@@ -46,7 +46,7 @@ jobs:
         with:
           push: true
           tags: ghcr.io/thedevminertv/postgres-s3-backup:latest
-          platforms: linux/amd64
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
           labels: |
             cache-from: type=local,src=/tmp/.buildx-cache
-            cache-to: type=local,dest=/tmp/.buildx-cache
+            cache-to: type=local,dest=/tmp/.buildx-cache