Correct platform name

When building with `podman-compose` on my Mac, I was seeing the below issue:
```
[2/3] STEP 1/3: FROM docker.io/bluerobotics/blueos-base:v0.0.10 AS downloadBinaries
Trying to pull docker.io/bluerobotics/blueos-base:v0.0.10...
Error: creating build container: choosing an image from manifest list docker://bluerobotics/blueos-base:v0.0.10: no image found in image index for architecture arm64, variant "v8", OS linux

exit code: 125
```

I believe this is because the wrong platform string is provided.

.github/workflows/deploy.yml

@@ -19,7 +19,7 @@ jobs:
         docker: [base]
         project: [companion]
         new_project: [blueos]
-        platforms: ["linux/arm/v7,linux/arm/v8,linux/amd64"]
+        platforms: ["linux/arm/v7,linux/arm64,linux/amd64"]
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -133,4 +133,4 @@ jobs:
         uses: actions/upload-artifact@v2
         with:
           name: BlueOS-base-docker-image.zip
-          path: '*.tar'
+          path: '*.tar'