services/nomad/build/buildbot: allow forcing packages to be considered

adds a field to the force scheduler that can let build ops manually take care
of the shortcomings of the previous change by specifying packages that
xbps-bulk should consider as a whitespace-separated list.

Author: classabbyamp

services/nomad/build/buildbot.cfg

@@ -117,7 +117,14 @@ c['schedulers'].append(schedulers.SingleBranchScheduler(
 
 c['schedulers'].append(schedulers.ForceScheduler(
     name="force",
-    builderNames=builder_names))
+    builderNames=builder_names,
+    properties=[
+        util.StringParameter(name="packages_force",
+                             label="Add packages to build:",
+                             default="", size=80)
+    ],
+    buttonName="Start Build",
+))
 
 
 # ###### BUILDERS
@@ -198,7 +205,8 @@ def make_xbps_bulk_cmd(props):
     else:
         command += ['-a', 'native-' + props.getProperty('host')]
     command += ['--']
-    command += props.getProperty('packages_changed').split()
+    command += props.getProperty('packages_changed', default="").split()
+    command += props.getProperty('packages_force', default="").split()
 
     return command