Load AMQP plugin into the Gru tasks

Makes possible to the minion tasks to emit events, as it makes the AMQP plugin
available in its context. The `one_tick` is called to trigger the `next_tick`
in the `register` function of the AMPQ module immediately, otherwise it seems
like it is registered late and the event is not emitted.

issue: https://progress.opensuse.org/issues/190557
Signed-off-by: Ioannis Bonatakis <[email protected]>

Author: d3flex

lib/OpenQA/Shared/Plugin/Gru.pm

@@ -10,7 +10,7 @@ use DBIx::Class::Timestamps 'now';
 use OpenQA::App;
 use OpenQA::Schema;
 use OpenQA::Shared::GruJob;
-use OpenQA::Log qw(log_debug log_info);
+use OpenQA::Log qw(log_debug log_info log_error);
 use OpenQA::Utils qw(sharedir);
 use Mojo::Pg;
 use Mojo::Promise;
@@ -98,6 +98,19 @@ sub register ($self, $app, $config) {
         });
 
     $self->register_tasks;
+    my $plugins = $app->config->{global}->{plugins};
+    if (defined $plugins && $plugins =~ /\bAMQP\b/) {
+        push @{$app->plugins->namespaces}, 'OpenQA::WebAPI::Plugin'
+          unless grep { $_ eq 'OpenQA::WebAPI::Plugin' } @{$app->plugins->namespaces};
+
+        try {
+            $app->plugin('AMQP');
+            Mojo::IOLoop->singleton->one_tick;
+        }
+        catch ($e) {
+            log_error("Failed to load AMQP plugin for Gru: $e");
+        }
+    }
 
     # Enable the Minion Admin interface under /minion
     my $auth = $app->routes->under('/minion')->to('session#ensure_admin');