a first stab at a docker compose up matrix 2.0 stack

.env-sample

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+# These env vars get templated into the configs in the respective containers via init scripts.
+#
+# If you want to make more customisations then either edit the templates to add more env variables below
+# (free free to contribute them back)
+# or edit the templates directly.
+
+# n.b. SECRETS_* env variables get pulled in on demand from files in ./secrets
+
+VOLUME_PATH=.
+DOMAIN=example.com
+HOMESERVER_FQDN=matrix.example.com
+ELEMENT_WEB_FQDN=element.example.com
+ELEMENT_CALL_FQDN=call.example.com
+MAS_FQDN=auth.example.com
+
+REPORT_STATS=yes
+
+IDENTITY_SERVER_URL=https://vector.im
+
+MAIL_NOTIF_FROM_ADDRESS=noreply@example.com
+ABUSE_SUPPORT_EMAIL=abuse@example.com
+SECURITY_SUPPORT_EMAIL=security@example.com
+
+MAS_CLIENT_ID="0000000000000000000SYNAPSE"
+MAS_EMAIL_FROM='"Authentication Service" <support@example.com>'
+MAS_EMAIL_REPLY_TO='"Authentication Service" <support@example.com>'
+
+COUNTRY=GB