Sanity test for podman

[kegsay]

We should make sure this can work with podman in addition to docker.

[richvdh]

It seemed to work for me, having upgraded to a version of complement including the fixes in matrix-org/complement#779.

I did:

systemctl --user enable --now podman.socket
./rebuild_js_sdk.sh matrix-js-sdk@file:$HOME/work/matrix-js-sdk
podman pull ghcr.io/matrix-org/synapse-service:v1.117.0
DOCKER_HOST=unix://$XDG_RUNTIME_DIR/podman/podman.sock \
  BUILDAH_FORMAT=docker \
  COMPLEMENT_HOSTNAME_RUNNING_COMPLEMENT=host.containers.internal \
  COMPLEMENT_CRYPTO_TEST_CLIENT_MATRIX=jj \
  COMPLEMENT_BASE_IMAGE=ghcr.io/matrix-org/synapse-service:v1.117.0 \
  go test -v -count=1 -tags=jssdk -timeout 15m -parallel 1 ./tests