CI: remove continue-on-error

Signed-off-by: Pascal Andy <pascalandy@users.noreply.github.com>

.github/workflows/multi_arch.yml

@@ -114,7 +114,7 @@ jobs:
       # The goal is the catch if multiarch builds have issue on branch edge without slowing down the dev UX.
       # Docs: list archs https://github.com/firepress-org/ghostfire/issues/57
       - uses: docker/setup-buildx-action@v1
-        name: Build linux/amd64
+      - name: Build linux/amd64
         uses: docker/build-push-action@v2
         with:
           context: .