appveyor: try podman 18

Author: vszakats

appveyor.yml

@@ -62,7 +62,7 @@ build_script:
       sudo rm -rf /etc/apt/sources.list.d/ubuntu-toolchain-*.list
       sudo apt-get -o Dpkg::Use-Pty=0 update
       sudo rm -f /var/lib/man-db/auto-update
-      sudo apt-get -o Dpkg::Use-Pty=0 install -y --no-install-suggests --no-install-recommends podman uidmap
+      sudo apt-get -o Dpkg::Use-Pty=0 install -y --no-install-suggests --no-install-recommends podman uidmap fuse-overlayfs
       export CW_CONFIG="${APPVEYOR_REPO_BRANCH}-werror-win"
       . ./_versions.sh
       sudo podman image trust set --type reject default