Add secret management command line options to documentation. (#247)

config/default.yaml

@@ -7,6 +7,8 @@ homeserverUrl: "https://matrix.org"
 rawHomeserverUrl: "https://matrix.org"
 
 # Matrix Access Token to use, Draupnir will only use this if pantalaimon.use is false.
+# This option can be loaded from a file by passing "--access-token-path <path>" at the command line,
+# which would allow using secret management systems such as systemd's service credentials.
 accessToken: "YOUR_TOKEN_HERE"
 
 # Options related to Pantalaimon (https://github.com/matrix-org/pantalaimon)
@@ -26,6 +28,8 @@ pantalaimon:
   # The password Draupnir will login with.
   #
   # After successfully logging in once, this will be ignored, so this value can be blanked after first startup.
+  # This option can be loaded from a file by passing "--pantalaimon-password-path <path>" at the command line,
+  # which would allow using secret management systems such as systemd's service credentials.
   password: your_password
 
 # Experimental usage of the matrix-bot-sdk rust crypto.
@@ -242,8 +246,6 @@ health:
     # and 1.0 means "trace performance at every opportunity".
     # tracesSampleRate: 0.5
 
-
-
 # Options for exposing web APIs.
 web:
   # Whether to enable web APIs.

docs/setup.md

@@ -20,11 +20,20 @@ admin, and the server needs to be Synapse.
 
 See the [sample configuration](../config/default.yaml) for documentation about individual config keys.
 
+## Secret Management
+
+If you need to use a secret management system, such as systemd's service credentials,
+the following options are available at the command line:
+
+- The access token can be provided with the option `--access-token-path`.
+- The Pantalaimon password can be provided with the option `--pantalaimon-password-path`.
+
 ## Installation
 
 On a high level, installing Draupnir works like the following;
+
 1. Creating an account for draupnir.
-    (Optional) Disable rate limits for that account.
+   (Optional) Disable rate limits for that account.
 2. Install draupnir, see below.
 3. Configure draupnir see [further below](#post-install).
 4. Start draupnir.
@@ -32,6 +41,7 @@ On a high level, installing Draupnir works like the following;
 Draupnir can be installed in two ways, via Docker, or building it yourself.
 
 See the below links for corresponding installation documentation;
+
 - [Docker](./setup_docker.md)
 - [Building It](./setup_selfbuild.md)