Simplify registration with email validation (#11398)

cypress/plugins/synapsedocker/templates/email/README.md

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+A synapse configured to require an email for registration

cypress/plugins/synapsedocker/templates/email/homeserver.yaml

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+server_name: "localhost"
+pid_file: /data/homeserver.pid
+public_baseurl: "{{PUBLIC_BASEURL}}"
+listeners:
+    - port: 8008
+      tls: false
+      bind_addresses: ["::"]
+      type: http
+      x_forwarded: true
+
+      resources:
+          - names: [client]
+            compress: false
+
+database:
+    name: "sqlite3"
+    args:
+        database: ":memory:"
+
+log_config: "/data/log.config"
+
+media_store_path: "/data/media_store"
+uploads_path: "/data/uploads"
+enable_registration: true
+registrations_require_3pid:
+    - email
+registration_shared_secret: "{{REGISTRATION_SECRET}}"
+report_stats: false
+macaroon_secret_key: "{{MACAROON_SECRET_KEY}}"
+form_secret: "{{FORM_SECRET}}"
+signing_key_path: "/data/localhost.signing.key"
+
+trusted_key_servers:
+    - server_name: "matrix.org"
+suppress_key_server_warning: true
+
+ui_auth:
+    session_timeout: "300s"
+
+email:
+    smtp_host: "%SMTP_HOST%"
+    smtp_port: %SMTP_PORT%
+    notif_from: "Your Friendly %(app)s homeserver <noreply@example.com>"
+    app_name: my_branded_matrix_server

cypress/plugins/synapsedocker/templates/email/log.config

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+# Log configuration for Synapse.
+#
+# This is a YAML file containing a standard Python logging configuration
+# dictionary. See [1] for details on the valid settings.
+#
+# Synapse also supports structured logging for machine readable logs which can
+# be ingested by ELK stacks. See [2] for details.
+#
+# [1]: https://docs.python.org/3.7/library/logging.config.html#configuration-dictionary-schema
+# [2]: https://matrix-org.github.io/synapse/latest/structured_logging.html
+
+version: 1
+
+formatters:
+    precise:
+        format: '%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - %(request)s - %(message)s'
+
+handlers:
+    # A handler that writes logs to stderr. Unused by default, but can be used
+    # instead of "buffer" and "file" in the logger handlers.
+    console:
+        class: logging.StreamHandler
+        formatter: precise
+
+loggers:
+    synapse.storage.SQL:
+        # beware: increasing this to DEBUG will make synapse log sensitive
+        # information such as access tokens.
+        level: INFO
+
+    twisted:
+        # We send the twisted logging directly to the file handler,
+        # to work around https://github.com/matrix-org/synapse/issues/3471
+        # when using "buffer" logger. Use "console" to log to stderr instead.
+        handlers: [console]
+        propagate: false
+
+root:
+    level: INFO
+
+    # Write logs to the `buffer` handler, which will buffer them together in memory,
+    # then write them to a file.
+    #
+    # Replace "buffer" with "console" to log to stderr instead. (Note that you'll
+    # also need to update the configuration for the `twisted` logger above, in
+    # this case.)
+    #
+    handlers: [console]
+
+disable_existing_loggers: false