feat: specify a custom "terms of service" link (#13068)

cli/testdata/coder_server_--help.golden

@@ -60,6 +60,10 @@ OPTIONS:
       --support-links struct[[]codersdk.LinkConfig], $CODER_SUPPORT_LINKS
           Support links to display in the top right drop down menu.
 
+      --terms-of-service-url string, $CODER_TERMS_OF_SERVICE_URL
+          A URL to an external Terms of Service that must be accepted by users
+          when logging in.
+
       --update-check bool, $CODER_UPDATE_CHECK (default: false)
           Periodically check for new releases of Coder and inform the owner. The
           check is performed once per day.

cli/testdata/server-config.yaml.golden

@@ -414,6 +414,10 @@ inMemoryDatabase: false
 # Type of auth to use when connecting to postgres.
 # (default: password, type: enum[password\|awsiamrds])
 pgAuth: password
+# A URL to an external Terms of Service that must be accepted by users when
+# logging in.
+# (default: <unset>, type: string)
+termsOfServiceURL: ""
 # The algorithm to use for generating ssh keys. Accepted values are "ed25519",
 # "ecdsa", or "rsa4096".
 # (default: ed25519, type: string)