FIXUP: KUTTL use linux base image

Author: cbandy

.github/workflows/test.yaml

@@ -84,25 +84,21 @@ jobs:
         run: |
           make build-postgres-operator PGO_VERSION=${{ github.sha }}
 
-          PGO=$(buildah from scratch)
-          buildah copy "$PGO" bin/postgres-operator /usr/local/bin/
-          buildah config --entrypoint '["/usr/local/bin/postgres-operator"]' "$PGO"
-          buildah commit --rm "$PGO" docker-daemon:localhost/postgres-operator:latest
-
       # Start a Docker container with the working directory mounted.
       - name: Start PGO
         run: |
           kubectl apply -k ./config/namespace; kubectl apply -k ./config/dev
           hack/create-kubeconfig.sh postgres-operator pgo
 
-          docker run --detach --network host --name 'postgres-operator' \
-            --workdir '/mnt' --volume "$(pwd):/mnt" \
+          docker run --detach --network host --read-only \
+            --volume "$(pwd):/mnt" --workdir '/mnt' --env 'PATH=/mnt/bin' \
             --env 'KUBECONFIG=hack/.kube/postgres-operator/pgo' \
             --env 'RELATED_IMAGE_PGADMIN=registry.developers.crunchydata.com/crunchydata/crunchy-pgadmin4:centos8-13.4-4.7.3' \
             --env 'RELATED_IMAGE_PGBACKREST=registry.developers.crunchydata.com/crunchydata/crunchy-pgbackrest:centos8-2.36-0' \
             --env 'RELATED_IMAGE_PGBOUNCER=registry.developers.crunchydata.com/crunchydata/crunchy-pgbouncer:centos8-1.16-0' \
             --env 'RELATED_IMAGE_POSTGRES_14=registry.developers.crunchydata.com/crunchydata/crunchy-postgres:centos8-14.1-0' \
-            localhost/postgres-operator
+            --name 'postgres-operator' ubuntu \
+            postgres-operator
 
       - name: Install KUTTL
         run: |