move ENV setting to devcontainer.json, update README

Author: Amblizer

containers/ruby-2-rails-5/.devcontainer/Dockerfile

@@ -37,6 +37,4 @@ RUN apt-get autoremove -y \
     && rm -rf /var/lib/apt/lists/*
 
 # Set the default shell to bash instead of sh
-ENV SHELL /bin/bash
-
-ENV PROJECT_NAME test-project
+ENV SHELL /bin/bash

containers/ruby-2-rails-5/.devcontainer/devcontainer.json

@@ -5,6 +5,10 @@
 		"rebornix.Ruby", 
 		"craigmaslowski.erb"
 	],
+	"runArgs": [
+		// change this to your project name to debug
+		"-e", "PROJECT_NAME=test-project"
+	], 
 	// Uncomment the next line if you want to publish any ports.
 	// "appPort": ["80:80"],
 

containers/ruby-2-rails-5/.vscode/tasks.json

@@ -3,25 +3,10 @@
     // for the documentation about the tasks.json format
     "version": "2.0.0",
     "tasks": [
-        {   // 2. bundle install in project folder
+        {   // bundle install in project folder
             "label": "bundleInstall",
-            "dependsOn": "setEnv",      // sequential
             "type": "shell",
-            "command": "cd ${env:PROJECT_NAME} && bundle install"
+            "command": "cd ${env:PROJECT_NAME} && bundle install && gem cleanup"
         }, 
-        {   // 1. input project name and set as env variable, the only way 
-            // to share it to launch.json. You can also hard code it.
-            "label": "setEnv",
-            "type": "shell",
-            "command": "export PROJECT_NAME=${input:projectName}"
-        }
     ], 
-    "inputs": [
-        {   // prompt user to input project name for debugging
-            "type": "promptString",
-            "id": "projectName",
-            "description": "Please input the name of the project to debug.",
-            "default": "test-project"
-        }
-    ]
 }

containers/ruby-2-rails-5/README.md

@@ -38,8 +38,8 @@ This definition includes some test code that will help you verify it is working
 2. Clone this repository.
 3. Start VS Code, press <kbd>F1</kbd>, and select **Remote-Containers: Open Folder in Container...**
 4. Select the `containers/ruby-2-rails-5` folder.
-5. After the folder has opened in the container, press <kbd>F5</kbd> to start the project. Enter the name of the project to debug at popup input bar (it is populated for the test-project).
-6. You should see "* Listening on tcp://0.0.0.0:80" in the Debug Console. press <kbd>F1</kbd>. Select **Remote-Containers: Forward Porrt From Container...** then choose **Forward 80**,  and by browsing http://localhost/ you should see "Yay! You’re on Rails!".
+5. After the folder has opened in the container, press <kbd>F5</kbd> to start the project.
+6. You should see "* Listening on tcp://0.0.0.0:80" in the Debug Console. Press <kbd>F1</kbd>. Select **Remote-Containers: Forward Porrt From Container...** then choose **Forward 80**,  and by browsing http://localhost/ you should see "Yay! You’re on Rails!".
 7. From here, you can add breakpoints or edit the contents of the `test-project` folder to do further testing.
 
 ## License