Displays loading icon in async buttons inline

app/assets/stylesheets/pages/environments.scss

@@ -64,6 +64,10 @@
       }
     }
 
+    .btn .text-center {
+      display: inline;
+    }
+
     .commit-title {
       margin: 0;
     }

app/assets/stylesheets/pages/pipelines.scss

@@ -88,6 +88,10 @@
         }
       }
 
+      .btn .text-center {
+        display: inline;
+      }
+
       .tooltip {
         white-space: nowrap;
       }