ci: fix multi-arch runner builds (#2048)

* ci: fix multi-arch runner builds

.github/workflows/runners.yaml

@@ -63,10 +63,6 @@ jobs:
           ghcr_username: ${{ github.actor }}
           ghcr_password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Set-Up Build Environment
-        run: |
-          echo "TARGETPLATFORM=$(arch)" >> $GITHUB_ENV
-
       - name: Build and Push Versioned Tags
         uses: docker/build-push-action@v3
         with:
@@ -75,7 +71,6 @@ jobs:
           platforms: linux/amd64,linux/arm64
           push: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' }}
           build-args: |
-            TARGETPLATFORM=${{ env.TARGETPLATFORM }}
             RUNNER_VERSION=${{ env.RUNNER_VERSION }}
             DOCKER_VERSION=${{ env.DOCKER_VERSION }}
             RUNNER_CONTAINER_HOOKS_VERSION=${{ env.RUNNER_CONTAINER_HOOKS_VERSION }}