Also build for linux/arm64 (#2)

Given that these images are small, we should be able to build arm64
images.

Signed-off-by: cicdguy <26552821+cicdguy@users.noreply.github.com>

Author: cicdguy

.github/workflows/deploy.yaml

@@ -2,7 +2,7 @@ name: Deploy image to GHCR 🪂
 
 env:
   REGISTRY: ghcr.io
-  PLATFORMS: linux/amd64
+  PLATFORMS: linux/amd64,linux/arm64
 
 on:
   repository_dispatch: