test: less fragile integration suite [ci skip]

See coop-cloud/organising#584
See coop-cloud/organising#595

tests/integration/app_volume.bats

@@ -18,10 +18,7 @@ setup(){
 }
 
 teardown(){
-  # https://github.com/bats-core/bats-core/issues/383#issuecomment-738628888
-  if [[ -z "${BATS_TEST_COMPLETED}" ]]; then
-    _undeploy_app
-  fi
+  _undeploy_app
 }
 
 @test "ls validate app argument" {
@@ -47,8 +44,6 @@ teardown(){
   run $ABRA app volume ls "$TEST_APP_DOMAIN"
   assert_success
   assert_output --partial 'test-volume'
-
-  _undeploy_app
 }
 
 @test "rm validate app argument" {
@@ -68,14 +63,13 @@ teardown(){
   run $ABRA app volume rm "$TEST_APP_DOMAIN" --force
   assert_failure
   assert_output --partial 'is still deployed'
-
-  _undeploy_app
 }
 
 # bats test_tags=slow
 @test "remove volumes" {
-  _deploy_app
+  sleep 3 # NOTE(d1): hack to avoid "network not found"
 
+  _deploy_app
   _undeploy_app
 
   run $ABRA app volume rm "$TEST_APP_DOMAIN" --force
@@ -85,8 +79,9 @@ teardown(){
 
 # bats test_tags=slow
 @test "remove no volumes" {
-  _deploy_app
+  sleep 3 # NOTE(d1): hack to avoid "network not found"
 
+  _deploy_app
   _undeploy_app
 
   run $ABRA app volume rm "$TEST_APP_DOMAIN" --force