Add optional support for running end-to-end tests and building documentation with rootless Podman instead of Docker.

scripts/run-end-to-end-dev-tests

@@ -10,5 +10,11 @@
 
 set -e
 
+USER_PODMAN_SOCKET_PATH=/run/user/$UID/podman/podman.sock
+
+if [ -e "$USER_PODMAN_SOCKET_PATH" ]; then
+    export DOCKER_HOST="unix://$USER_PODMAN_SOCKET_PATH"
+fi
+
 docker-compose --file tests/end-to-end/docker-compose.yaml up --force-recreate \
     --renew-anon-volumes --abort-on-container-exit