for bundle build use --squash-all and --no-cache

On the second push to a repository in quay.io all images are converted
to schema v1. To work around this bug we build the container image
with --no-cache --squash-all. Because docker doesn't support
--squash-all we switch to use podman until the workaround is not needed
any more.

Signed-off-by: Jens Freimann <jfreimann@redhat.com>

Makefile

@@ -120,4 +120,4 @@ bundle: manifests
 # Build the bundle image.
 .PHONY: bundle-build
 bundle-build:
-	docker build -f bundle.Dockerfile -t $(BUNDLE_IMG) .
+	podman build --squash-all --no-cache -f bundle.Dockerfile -t $(BUNDLE_IMG) .