Enable BorderZero rule in scss-lint

.scss-lint.yml

@@ -14,7 +14,7 @@ linters:
   # Whether or not to prefer `border: 0` over `border: none`.
   BorderZero:
-    enabled: false
+    enabled: true
   # Reports when you define a rule set using a selector with chained classes
   # (a.k.a. adjoining classes).

app/assets/stylesheets/framework/avatar.scss

@@ -59,7 +59,7 @@
   &.avatar-tile {
     border-radius: 0;
-    border: none;
+    border: 0;
   }
   &:not([href]):hover {
@@ -96,7 +96,7 @@
   .avatar {
     border-radius: 0;
-    border: none;
+    border: 0;
     height: auto;
     width: 100%;
     margin: 0;

app/assets/stylesheets/framework/blocks.scss

@@ -39,7 +39,7 @@
   }
   &.top-block {
-    border-top: none;
+    border-top: 0;
     .container-fluid {
       background-color: inherit;
@@ -63,7 +63,7 @@
   &.footer-block {
     margin-top: 0;
-    border-bottom: none;
+    border-bottom: 0;
     margin-bottom: -$gl-padding;
   }
@@ -100,7 +100,7 @@
   &.build-content {
     background-color: $white-light;
-    border-top: none;
+    border-top: 0;
   }
 }
@@ -287,12 +287,12 @@
     cursor: pointer;
     color: $blue-300;
     z-index: 1;
-    border: none;
+    border: 0;
     background-color: transparent;
     &:hover,
     &:focus {
-      border: none;
+      border: 0;
       color: $blue-400;
     }
   }

app/assets/stylesheets/framework/buttons.scss

@@ -304,7 +304,7 @@
 }
 .btn-clipboard {
-  border: none;
+  border: 0;
   padding: 0 5px;
 }

app/assets/stylesheets/framework/common.scss

@@ -28,7 +28,7 @@
 pre {
   &.clean {
     background: none;
-    border: none;
+    border: 0;
     margin: 0;
     padding: 0;
   }
@@ -142,7 +142,7 @@ li.note {
   img { max-width: 100%; }
   .note-title {
     li {
-      border-bottom: none !important;
+      border-bottom: 0 !important;
     }
   }
 }
@@ -187,7 +187,7 @@ li.note {
   pre {
     background: $white-light;
-    border: none;
+    border: 0;
     font-size: 12px;
   }
 }
@@ -386,7 +386,7 @@ img.emoji {
 }
 .hide-bottom-border {
-  border-bottom: none !important;
+  border-bottom: 0 !important;
 }
 .gl-accessibility {

app/assets/stylesheets/framework/files.scss

@@ -142,7 +142,7 @@
      */
     &.blame {
       table {
-        border: none;
+        border: 0;
         margin: 0;
       }
@@ -150,20 +150,20 @@
         border-bottom: 1px solid $blame-border;
         &:last-child {
-          border-bottom: none;
+          border-bottom: 0;
         }
       }
       td {
-        border-top: none;
-        border-bottom: none;
+        border-top: 0;
+        border-bottom: 0;
         &:first-child {
-          border-left: none;
+          border-left: 0;
         }
         &:last-child {
-          border-right: none;
+          border-right: 0;
         }
         &.blame-commit {

app/assets/stylesheets/framework/filters.scss

@@ -255,7 +255,7 @@
   .clear-search {
     width: 35px;
     background-color: $white-light;
-    border: none;
+    border: 0;
     outline: none;
     z-index: 1;
@@ -418,7 +418,7 @@
 .droplab-dropdown .dropdown-menu .filter-dropdown-item {
   .btn {
-    border: none;
+    border: 0;
     width: 100%;
     text-align: left;
     padding: 8px 16px;

app/assets/stylesheets/framework/header.scss

@@ -10,7 +10,7 @@
     z-index: 1000;
     margin-bottom: 0;
     min-height: $header-height;
-    border: none;
+    border: 0;
     border-bottom: 1px solid $border-color;
     position: fixed;
     top: 0;
@@ -169,7 +169,7 @@
   .navbar-collapse {
     flex: 0 0 auto;
-    border-top: none;
+    border-top: 0;
     padding: 0;
     @media (max-width: $screen-xs-max) {

app/assets/stylesheets/framework/highlight.scss

 .file-content.code {
-  border: none;
+  border: 0;
   box-shadow: none;
   margin: 0;
   padding: 0;
@@ -7,7 +7,7 @@
   pre {
     padding: 10px 0;
-    border: none;
+    border: 0;
     border-radius: 0;
     font-family: $monospace_font;
     font-size: $code_font_size;

app/assets/stylesheets/framework/lists.scss

@@ -42,7 +42,7 @@
     }
     &:last-child {
-      border-bottom: none;
+      border-bottom: 0;
       &.bottom {
         background: $gray-light;
@@ -92,7 +92,7 @@ ul.unstyled-list {
 }
 ul.unstyled-list > li {
-  border-bottom: none;
+  border-bottom: 0;
 }
 // Generic content list
@@ -178,7 +178,7 @@ ul.content-list {
     // When dragging a list item
     &.ui-sortable-helper {
-      border-bottom: none;
+      border-bottom: 0;
     }
     &.list-placeholder {
@@ -295,7 +295,7 @@ ul.indent-list {
   }
   > .group-list-tree > .group-row.has-children:first-child {
-    border-top: none;
+    border-top: 0;
   }
 }
@@ -413,7 +413,7 @@ ul.indent-list {
     padding: 0;
     &.has-children {
-      border-top: none;
+      border-top: 0;
     }
     &:first-child {

app/assets/stylesheets/framework/mixins.scss

@@ -36,7 +36,7 @@
     margin: 0;
     &:last-child {
-      border-bottom: none;
+      border-bottom: 0;
     }
     &.active {

app/assets/stylesheets/framework/responsive_tables.scss

@@ -24,7 +24,7 @@
   @media (min-width: $screen-md-min) {
     margin: 0;
     padding: $gl-padding 0;
-    border: none;
+    border: 0;
     &:not(:last-child) {
       border-bottom: 1px solid $white-normal;

app/assets/stylesheets/framework/secondary-navigation-elements.scss

@@ -63,7 +63,7 @@
   .nav-links {
     margin-bottom: 0;
-    border-bottom: none;
+    border-bottom: 0;
     float: left;
     &.wide {
@@ -335,7 +335,7 @@
     border-bottom: 1px solid $border-color;
     .nav-links {
-      border-bottom: none;
+      border-bottom: 0;
     }
   }
 }

app/assets/stylesheets/framework/selects.scss

@@ -17,7 +17,7 @@
     .select2-arrow {
       background-image: none;
       background-color: transparent;
-      border: none;
+      border: 0;
       padding-top: 12px;
       padding-right: 20px;
       font-size: 10px;

app/assets/stylesheets/framework/sidebar.scss

@@ -9,7 +9,7 @@
     &.container-blank {
       background: none;
       padding: 0;
-      border: none;
+      border: 0;
     }
   }
 }
@@ -111,7 +111,7 @@
     }
     .block:last-of-type {
-      border: none;
+      border: 0;
     }
   }

app/assets/stylesheets/framework/tables.scss

@@ -33,7 +33,7 @@ table {
       th {
         background-color: $gray-light;
         font-weight: $gl-font-weight-normal;
-        border-bottom: none;
+        border-bottom: 0;
         &.wide {
           width: 55%;

app/assets/stylesheets/framework/timeline.scss

@@ -21,7 +21,7 @@
   }
   &.text-file .diff-file {
-    border-bottom: none;
+    border-bottom: 0;
   }
 }
@@ -66,5 +66,5 @@
 .discussion .timeline-entry {
   margin: 0;
-  border-right: none;
+  border-right: 0;
 }

app/assets/stylesheets/framework/typography.scss

@@ -167,7 +167,7 @@
     &.plain-readme {
       background: none;
-      border: none;
+      border: 0;
       padding: 0;
       margin: 0;
       font-size: 14px;

app/assets/stylesheets/framework/zen.scss

@@ -9,7 +9,7 @@
     z-index: 1031;
     textarea {
-      border: none;
+      border: 0;
       box-shadow: none;
       border-radius: 0;
       color: $black;

app/assets/stylesheets/pages/builds.scss

@@ -48,7 +48,7 @@
     overflow-x: auto;
     font-size: 12px;
     border-radius: 0;
-    border: none;
+    border: 0;
     .bash {
       display: block;