add `now.json:name` field support

lib/read-metadata.js

@@ -40,10 +40,15 @@ async function readMetaData(path, {
     }
   }
 
-  // user can specify the type of deployment explicitly in the `now.json` file
-  // when both a package.json and Dockerfile exist
-  if (hasNowJson && nowConfig.type) {
-    deploymentType = nowConfig.type
+  if (hasNowJson) {
+    // user can specify the type of deployment explicitly in the `now.json` file
+    // when both a package.json and Dockerfile exist
+    if (nowConfig.type) {
+      deploymentType = nowConfig.type
+    }
+    if (nowConfig.name) {
+      deploymentName = nowConfig.name
+    }
   }
 
   if (deploymentType === 'npm') {
@@ -123,7 +128,11 @@ async function readMetaData(path, {
         name = basename(path)
 
         if (!quiet) {
-          console.log(`> No \`name\` LABEL in \`Dockerfile\`, using ${chalk.bold(name)}`)
+          if (hasNowJson) {
+            console.log(`> No \`name\` LABEL in \`Dockerfile\` or \`name\` field in `\now.json\`, using ${chalk.bold(name)}`)
+          } else {
+            console.log(`> No \`name\` LABEL in \`Dockerfile\`, using ${chalk.bold(name)}`)
+          }
         }
       }
     }