fix: don't run a nix installer on qemu image build (#1916)

* fix: Detect if it's running on a self-hosted runner and skip nix install

* fix: limit to arm-native-runner

* fix: can just not run in workflow

* fix: remove logic

Author: samrose

.github/workflows/qemu-image-build.yml

@@ -48,8 +48,6 @@ jobs:
       - name: Checkout Repo
         uses: supabase/postgres/.github/actions/shared-checkout@HEAD
 
-      - uses: ./.github/actions/nix-install-ephemeral
-
       - name: Run checks if triggered manually
         if: ${{ github.event_name == 'workflow_dispatch' }}
         run: |