use Ruby 2.5

Author: mwunderl

sample-apps/blank-ruby/README.md

@@ -11,7 +11,7 @@ The project source includes function code and supporting resources:
 Use the following instructions to deploy the sample application.
 
 # Requirements
-- [Ruby 2.7](https://www.ruby-lang.org/en/downloads/)
+- [Ruby 2.5](https://www.ruby-lang.org/en/downloads/)
 - The Bash shell. For Linux and macOS, this is included by default. In Windows 10, you can install the [Windows Subsystem for Linux](https://docs.microsoft.com/en-us/windows/wsl/install-win10) to get a Windows-integrated version of Ubuntu and Bash.
 - [The AWS CLI](https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-install.html).
 

sample-apps/blank-ruby/images/blank-ruby-servicemap.png

@@ -0,0 +1,32 @@
+AWSTemplateFormatVersion: '2010-09-09'
+Transform: 'AWS::Serverless-2016-10-31'
+Description: An AWS Lambda application that calls the Lambda API.
+Resources:
+  function:
+    Type: AWS::Serverless::Function
+    Properties:
+      Handler: lambda_function.lambda_handler
+      Runtime: ruby2.7
+      CodeUri: function/.
+      Description: Call the AWS Lambda API
+      Timeout: 10
+      # Function's execution role
+      Policies:
+        - AWSLambdaBasicExecutionRole
+        - AWSLambdaReadOnlyAccess
+        - AWSXrayWriteOnlyAccess
+      Tracing: Active
+      Environment:
+          Variables:
+            GEM_PATH: /opt/ruby/2.7.0
+      Layers:
+        - !Ref libs
+  libs:
+    Type: AWS::Serverless::LayerVersion
+    Properties:
+      LayerName: blank-ruby-lib
+      Description: Dependencies for the blank-ruby sample app.
+      ContentUri: lib/.
+      CompatibleRuntimes:
+        - ruby2.7
+

sample-apps/blank-ruby/images/blank-ruby-trace.png

@@ -6,7 +6,7 @@ Resources:
     Type: AWS::Serverless::Function
     Properties:
       Handler: lambda_function.lambda_handler
-      Runtime: ruby2.7
+      Runtime: ruby2.5
       CodeUri: function/.
       Description: Call the AWS Lambda API
       Timeout: 10
@@ -18,7 +18,7 @@ Resources:
       Tracing: Active
       Environment:
           Variables:
-            GEM_PATH: /opt/ruby/2.7.0
+            GEM_PATH: /opt
       Layers:
         - !Ref libs
   libs:
@@ -28,5 +28,5 @@ Resources:
       Description: Dependencies for the blank-ruby sample app.
       ContentUri: lib/.
       CompatibleRuntimes:
-        - ruby2.7
+        - ruby2.5