implement error_on_unknown_config_opts, slightly improve related code

Signed-off-by: June Strawberry <june@vern.cc>

docker/Dockerfile.complement

@@ -62,8 +62,8 @@ COPY <<EOF complement.toml
     database_path = "/database"
     dns_attempts = 20
     dns_timeout = 60
+    error_on_unknown_config_opts = true
     federation_idle_timeout = 300
-    intentionally_unknown_config_option_for_testing = true
     ip_range_denylist = []
     log = "debug,tuwunel=trace,h2=warn,hyper=warn"
     log_colors = false

docker/Dockerfile.matrix-rust-sdk

@@ -35,6 +35,7 @@ COPY <<EOF tuwunel.toml
     allow_public_room_directory_without_auth = true
     allow_registration = true
     create_admin_room = false
+    error_on_unknown_config_opts = true
     ip_range_denylist = []
     log = "debug,tuwunel=trace,h2=warn,hyper=warn"
     log_colors = false

docker/Dockerfile.nix

@@ -65,6 +65,7 @@ RUN \
             -- \
             -Otest='["smoke", "fresh"]' \
             -Oserver_name=\"localhost\" \
+            -Oerror_on_unknown_config_opts=true \
 EOF
 
 

docker/Dockerfile.smoketest

@@ -19,7 +19,8 @@ RUN <<EOF
     tuwunel \
         -Otest='["smoke"]' \
         -Oserver_name=\"localhost\" \
-        -Odatabase_path=\"${TUWUNEL_DATABASE_PATH}\"
+        -Odatabase_path=\"${TUWUNEL_DATABASE_PATH}\" \
+        -Oerror_on_unknown_config_opts=true
 
     rm -rf "${TUWUNEL_DATABASE_PATH}"
 EOF
@@ -44,7 +45,8 @@ RUN <<EOF
             -Otest='["smoke"]' \
             -Oserver_name=\"localhost\" \
             -Odatabase_path=\"${TUWUNEL_DATABASE_PATH}\" \
-            -Odb_pool_max_workers=${db_pool_max_workers}
+            -Odb_pool_max_workers=${db_pool_max_workers} \
+            -Oerror_on_unknown_config_opts=true
 
     rm -rf "${TUWUNEL_DATABASE_PATH}"
 EOF
@@ -62,7 +64,8 @@ RUN <<EOF
         tuwunel \
             -Otest='["smoke"]' \
             -Oserver_name=\"localhost\" \
-            -Odatabase_path=\"${TUWUNEL_DATABASE_PATH}\"
+            -Odatabase_path=\"${TUWUNEL_DATABASE_PATH}\" \
+            -Oerror_on_unknown_config_opts=true
 
     rm -rf "${TUWUNEL_DATABASE_PATH}"
 EOF