cov: Add io tests for basic cli commands and invalid config options

Full code coverage for Config.hs except expected overlays.

test/io-tests/configs/expected/types.config

@@ -0,0 +1,25 @@
+db-anon-role = "required"
+db-channel = "pgrst"
+db-channel-enabled = false
+db-extra-search-path = "public"
+db-max-rows = ""
+db-pool = 10
+db-pool-timeout = 10
+db-pre-request = ""
+db-prepared-statements = true
+db-root-spec = ""
+db-schemas = "required"
+db-tx-end = "commit"
+db-uri = "required"
+jwt-aud = ""
+jwt-role-claim-key = ".\"role\""
+jwt-secret = ""
+jwt-secret-is-base64 = false
+log-level = "error"
+openapi-server-proxy-uri = ""
+raw-media-types = ""
+server-host = "!4"
+server-port = 3000
+server-unix-socket = ""
+server-unix-socket-mode = "660"
+app.settings.test = "Bool False"

test/io-tests/configs/invalid.yaml

@@ -0,0 +1,4 @@
+yaml:
+  is:
+    not:
+      supported:

test/io-tests/configs/types.config

@@ -0,0 +1,16 @@
+# tests how config options fall back with invalid types
+db-anon-role = "required"
+db-schemas = "required"
+db-uri = "required"
+
+# expects string
+app.settings.test = false
+
+# expects boolean or string
+db-channel-enabled = 13
+
+# expects integer or string
+db-max-rows = true
+
+# expects string
+raw-media-types = true