message: Fix missing solr-7.7 build target
diff: @@ -331,10 +331,11 @@ $(build-solrimages): build/commons
  base-images-with-versions += $(solrimages)
  s3-images += $(solrimages)
  -build/solr__5.5 build/solr__6.6 build/solr__7.5: images/commons
  +build/solr__5.5 build/solr__6.6 build/solr__7.5 build/solr__7.7: images/commons
  build/solr__5.5-drupal: build/solr__5.5
  build/solr__6.6-drupal: build/solr__6.6
  build/solr__7.5-drupal: build/solr__7.5
  +build/solr__7.7-drupal: build/solr__7.7
  build/solr__5.5-ckan: build/solr__5.5
  build/solr__6.6-ckan: build/solr__6.6
  