Pass JVB_AUTH_PASSWORD environment variable to make JVB startup happy

We define this password in the `sip-communicator.properties`
configuration file, so this is not needed for actually running JVB.

However, it does a (useless) safety check during container startup,
and we need to make that check happy.

roles/matrix-jitsi/templates/jvb/env.j2

@@ -0,0 +1 @@
+JVB_AUTH_PASSWORD={{ matrix_jitsi_jvb_auth_password }}

roles/matrix-jitsi/templates/jvb/matrix-jitsi-jvb.service.j2

@@ -14,6 +14,7 @@ ExecStartPre=-/usr/bin/docker rm matrix-jitsi-jvb
 ExecStart=/usr/bin/docker run --rm --name matrix-jitsi-jvb \
 			--log-driver=none \
 			--network={{ matrix_docker_network }} \
+			--env-file={{ matrix_jitsi_jvb_base_path }}/env \
 			{% if matrix_jitsi_jvb_container_rtp_udp_host_bind_port %}
 			-p {{ matrix_jitsi_jvb_container_rtp_udp_host_bind_port }}:{{ matrix_jitsi_jvb_rtp_udp_port }}/udp \
 			{% endif %}