Add preview image: broadcast tx

frontend/src/app/components/push-transaction/push-transaction.component.ts

@@ -3,6 +3,7 @@ import { UntypedFormBuilder, UntypedFormGroup, Validators } from '@angular/forms
 import { ApiService } from '../../services/api.service';
 import { StateService } from '../../services/state.service';
 import { SeoService } from '../../services/seo.service';
+import { OpenGraphService } from '../../services/opengraph.service';
 import { seoDescriptionNetwork } from '../../shared/common.utils';
 
 @Component({
@@ -21,6 +22,7 @@ export class PushTransactionComponent implements OnInit {
     private apiService: ApiService,
     public stateService: StateService,
     private seoService: SeoService,
+    private ogService: OpenGraphService,
   ) { }
 
   ngOnInit(): void {
@@ -30,6 +32,7 @@ export class PushTransactionComponent implements OnInit {
 
     this.seoService.setTitle($localize`:@@meta.title.push-tx:Broadcast Transaction`);
     this.seoService.setDescription($localize`:@@meta.description.push-tx:Broadcast a transaction to the ${this.stateService.network==='liquid'||this.stateService.network==='liquidtestnet'?'Liquid':'Bitcoin'}${seoDescriptionNetwork(this.stateService.network)} network using the transaction's hash.`);
+    this.ogService.setManualOgImage('broadcast-tx.jpg');
   }
 
   postTx() {