nixos-install: pass through keep-going flag

nixos/doc/manual/man-nixos-install.xml

@@ -106,6 +106,12 @@
     </arg>
    </arg>
 
+   <arg>
+    <arg choice='plain'>
+     <option>--keep-going</option>
+    </arg>
+   </arg>
+
    <arg>
     <arg choice='plain'>
      <option>--help</option>
@@ -301,6 +307,17 @@
      </para>
     </listitem>
    </varlistentry>
+   <varlistentry>
+    <term>
+     <option>--keep-going</option>
+    </term>
+    <listitem>
+     <para>
+      Causes Nix to continue building derivations as far as possible
+      in the face of failed builds.
+     </para>
+    </listitem>
+   </varlistentry>
    <varlistentry>
     <term>
      <option>--help</option>

nixos/modules/installer/tools/nixos-install.sh

@@ -64,7 +64,7 @@ while [ "$#" -gt 0 ]; do
         --no-bootloader)
             noBootLoader=1
             ;;
-        --show-trace|--impure)
+        --show-trace|--impure|--keep-going)
             extraBuildFlags+=("$i")
             ;;
         --help)