update to higlight.js 8.4

vendor/assets/javascripts/highlight_js/languages/dockerfile.js

@@ -0,0 +1,42 @@
+/*
+Language: Dockerfile
+Requires: bash.js
+Author: Alexis Hénaut <alexis@henaut.net>
+Description: language definition for Dockerfile files
+Category: config
+*/
+
+function(hljs) {
+  return {
+    aliases: ['docker'],
+    case_insensitive: true,
+    keywords: {
+      built_ins: 'from maintainer cmd expose add copy entrypoint volume user workdir onbuild run env'
+    },
+    contains: [
+      hljs.HASH_COMMENT_MODE,
+      {
+        keywords : {
+          built_in: 'run cmd entrypoint volume add copy workdir onbuild'
+        },
+        begin: /^ *(onbuild +)?(run|cmd|entrypoint|volume|add|copy|workdir) +/,
+        starts: {
+          end: /[^\\]\n/,
+          subLanguage: 'bash', subLanguageMode: 'continuous'
+        }
+      },
+      {
+        keywords: {
+          built_in: 'from maintainer expose env user onbuild'
+        },
+        begin: /^ *(onbuild +)?(from|maintainer|expose|env|user|onbuild) +/, end: /[^\\]\n/,
+        contains: [
+          hljs.APOS_STRING_MODE,
+          hljs.QUOTE_STRING_MODE,
+          hljs.NUMBER_MODE,
+          hljs.HASH_COMMENT_MODE
+        ]
+      }
+    ]
+  }
+}