Add gerritbot-matrix identity lookup configuration

This change enables the bot to loopup gerrit identity on the matrix.

Change-Id: I18d286e249cc02b83c97a575de564fe1a6d984aa

playbooks/roles/matrix-gerritbot/README.rst

@@ -22,3 +22,13 @@ Delete the token:
 .. code-block::
 
     curl -H "Authorization: Bearer ${MATRIX_TOKEN}" -X POST ${HOMESERVER_URL}/_matrix/client/r0/logout -d{}
+
+Create the *gerritbot_matrix_identity_token* with this command:
+
+.. code-block::
+
+    MATRIX_OPENID=$(curl -XPOST ${HOMESERVER_URL}/_matrix/client/r0/user/${USER}/openid/request_token -H "Authorization: Bearer ${MATRIX_TOKEN}" -d '{}')
+    IDENTITY_URL="https://matrix.org"
+
+    export MATRIX_IDENTITY_TOKEN=$(curl -XPOST ${IDENTITY_URL}/_matrix/identity/v2/account/register -d "${MATRIX_OPENID}" | jq -r '.access_token')
+    echo "gerritbot_matrix_identity_token: ${MATRIX_IDENTITY_TOKEN}"

playbooks/roles/matrix-gerritbot/defaults/main.yaml

@@ -15,3 +15,5 @@ gerritbot_gerrit_user: "gerritbot"
 # matrix configuration
 gerritbot_matrix_homeserver: "https://opendev.ems.host"
 gerritbot_matrix_access_token: ""
+gerritbot_matrix_identityserver: "https://matrix.org"
+gerritbot_matrix_identity_token: ""

playbooks/roles/matrix-gerritbot/templates/docker-compose.yaml.j2

@@ -13,6 +13,7 @@ services:
         tag: "docker-matrix-gerritbot"
     environment:
       MATRIX_TOKEN: {{ gerritbot_matrix_access_token }}
+      MATRIX_IDENTITY_TOKEN: {{ gerritbot_matrix_identity_token }}
     volumes:
       - /var/lib/matrix-gerritbot/config:/config
       - /var/lib/matrix-gerritbot/ssh:/root/.ssh
@@ -24,5 +25,6 @@ services:
       --gerrit-host     {{ gerritbot_gerrit_host }}
       --gerrit-user     {{ gerritbot_gerrit_user }}
       --homeserver-url  {{ gerritbot_matrix_homeserver }}
+      --identity-url    {{ gerritbot_matrix_identityserver }}
       --config-file     /config/gerritbot.dhall
       --monitoring-port {{ gerritbot_matrix_prometheus_port }}