Set up MongoDB as a single-server replication set

This is necessary because the account server uses transactions, which only work in a replication set.

compose.yml

@@ -53,6 +53,12 @@ services:
             # For connecting with mongosh or MongoDB Compass
             - 127.0.0.1:27017:27017
         volumes:
+            - type: bind
+              source: ./config/mongod.conf
+              target: /etc/mongod.conf
+            - type: bind
+              source: ./config/mongodb-init.js
+              target: /docker-entrypoint-initdb.d/init.js
             - type: volume
               source: mongodb-database
               target: /data/db

config/mongod.conf

@@ -0,0 +1,10 @@
+storage:
+    dbPath: /data/db
+
+net:
+    port: 27017
+    bindIp: 0.0.0.0
+
+replication:
+    oplogSizeMB: 2000
+    replSetName: rs

config/mongodb-init.js

@@ -0,0 +1 @@
+rs.initiate();

environment/account.env

@@ -1,7 +1,7 @@
 GENERATE_NEW_KEYS=true
 PN_ACT_PREFER_ENV_CONFIG=true
 PN_ACT_CONFIG_HTTP_PORT=8080
-PN_ACT_CONFIG_MONGO_CONNECTION_STRING=mongodb://mongodb:27017/pretendo_account
+PN_ACT_CONFIG_MONGO_CONNECTION_STRING=mongodb://mongodb:27017/pretendo_account?replicaSet=rs&directConnection=true
 PN_ACT_CONFIG_MONGOOSE_OPTION_useNewUrlParser=true
 PN_ACT_CONFIG_MONGOOSE_OPTION_useUnifiedTopology=true
 PN_ACT_CONFIG_S3_ENDPOINT=http://minio:9000