test-install: Enable debug logging for chunkah build step

Turn on `podman --log-level=debug` and `RUST_LOG=chunkah=debug` for
the chunkah build invocation in priv-integration.sh. This step
converts the FCOS test image into a non-ostree image and previously
had no visibility into podman or chunkah internals when something
went wrong here (as with the host-namespace-escape hang fixed in the
prior commit). Cheap to leave on permanently since chunkah's own
progress output is otherwise sparse, and useful for any future
regressions in this step regardless of cause.

This was originally proposed as part of PR bootc-dev#2392 alongside a
(different, since superseded) fix attempt for the same underlying
hang; keeping it here since it's independently useful.

Assisted-by: AI
Signed-off-by: Colin Walters <walters@verbum.org>

Author: cgwalters

crates/ostree-ext/ci/priv-integration.sh

@@ -160,10 +160,11 @@ ostree container image prune-images --full --sysroot="${sysroot}"
 # See also https://github.com/coreos/chunkah?tab=readme-ov-file#compatibility-with-bootable-bootc-images
 nonostree_archive=/var/tmp/nonostree.ociarchive
 chunkah_config="$(podman inspect ${image})"
-podman run --rm \
+podman --log-level=debug run --rm \
     --mount=type=image,src=${image},dst=/chunkah \
     -v /var/tmp:/output:z \
     -e CHUNKAH_CONFIG_STR="${chunkah_config}" \
+    -e RUST_LOG=chunkah=debug \
     quay.io/coreos/chunkah build \
     --prune /sysroot/ \
     --label ostree.commit- \