Add ruby 2.3 and ruby 2.5 runtimes (#926)

* Move Dockerfile to its specific version

* Add ruby 2.3 based on the bitnami ruby 2.3 container

* Add ruby 2.5 based on the bitnami ruby 2.5 container

* Include ruby 2.3 and ruby 2.5 in the build process

* Add ruby 2.3 and 2.5 to the documented runtimes

* Reference correctly to the versioned Dockerfiles

* Add versions and update ruby24 to newly build runtimeImage

Author: blijblijblij

docker/runtime/ruby/Dockerfile.2.3

@@ -0,0 +1,14 @@
+FROM bitnami/ruby:2.3
+
+LABEL maintainer "Bitnami <[email protected]>"
+
+ENV RACK_ENV="production"
+ENV FUNC_PROCESS="ruby /kubeless.rb"
+RUN gem install sinatra --no-rdoc --no-ri
+
+ADD kubeless.rb /
+
+USER 1000
+
+ADD proxy /
+CMD [ "/proxy" ]

docker/runtime/ruby/Dockerfile renamed to docker/runtime/ruby/Dockerfile.2.4

@@ -0,0 +1,14 @@
+FROM bitnami/ruby:2.5
+
+LABEL maintainer "Bitnami <[email protected]>"
+
+ENV RACK_ENV="production"
+ENV FUNC_PROCESS="ruby /kubeless.rb"
+RUN gem install sinatra --no-rdoc --no-ri
+
+ADD kubeless.rb /
+
+USER 1000
+
+ADD proxy /
+CMD [ "/proxy" ]

docker/runtime/ruby/Dockerfile.2.5

@@ -1,11 +1,25 @@
 
+build2.3:
+	env GOOS=linux GOARCH=amd64 go build $$GOPATH/src/github.com/kubeless/kubeless/pkg/function-proxy/proxy.go
+	docker build -t kubeless/ruby:2.3$$RUNTIME_TAG_MODIFIER -f Dockerfile.2.3 .
+
 build2.4:
 	env GOOS=linux GOARCH=amd64 go build $$GOPATH/src/github.com/kubeless/kubeless/pkg/function-proxy/proxy.go
-	docker build -t kubeless/ruby:2.4$$RUNTIME_TAG_MODIFIER -f Dockerfile .
+	docker build -t kubeless/ruby:2.4$$RUNTIME_TAG_MODIFIER -f Dockerfile.2.4 .
+
+build2.5:
+	env GOOS=linux GOARCH=amd64 go build $$GOPATH/src/github.com/kubeless/kubeless/pkg/function-proxy/proxy.go
+	docker build -t kubeless/ruby:2.5$$RUNTIME_TAG_MODIFIER -f Dockerfile.2.5 .
+
+push2.3:
+	docker push kubeless/ruby:2.3$$RUNTIME_TAG_MODIFIER
 
 push2.4:
 	docker push kubeless/ruby:2.4$$RUNTIME_TAG_MODIFIER
 
+push2.5:
+	docker push kubeless/ruby:2.5$$RUNTIME_TAG_MODIFIER
+
 # Mandatory jobs
-build-all: build2.4
-push-all: push2.4
+build-all: build2.3 build2.4 build2.5
+push-all: push2.3 push2.4 push2.5

docker/runtime/ruby/Makefile

@@ -4,7 +4,7 @@ By default Kubeless has support for the following runtimes:
 
  - Python: For the branches 2.7, 3.4 and 3.6
  - NodeJS: For the branches 6 and 8, as well as NodeJS [distroless](https://github.com/GoogleContainerTools/distroless) for the branch 8
- - Ruby: For the branch 2.4
+ - Ruby: For the branches 2.3, 2.4 and 2.5
  - PHP: For the branch 7.2
  - Golang: For the branch 1.10
  - .NET: For the branch 2.0
@@ -15,7 +15,7 @@ You can see the list of supported runtimes executing:
 ```console
 $ kubeless get-server-config
 INFO[0000] Current Server Config:
-INFO[0000] Supported Runtimes are: python2.7, python3.4, python3.6, nodejs6, nodejs8, ruby2.4, php7.2, go1.10, dotnetcore2.0, java1.8, ballerina0.981.0
+INFO[0000] Supported Runtimes are: python2.7, python3.4, python3.6, nodejs6, nodejs8, ruby2.3, ruby2.4, ruby2.5, php7.2, go1.10, dotnetcore2.0, java1.8, ballerina0.981.0
 ```
 
 Each runtime is encapsulated in a container image. The reference to these images are injected in the Kubeless configuration. You can find the source code of all runtimes in [`docker/runtime`](https://github.com/kubeless/kubeless/tree/master/docker/runtime).
@@ -576,4 +576,4 @@ One can use kubeless-config to override the default liveness probe. By default,
   "timeoutSeconds": 30
 },
 "depname": ""
-```
+```

docs/runtimes.md

@@ -144,11 +144,23 @@ local runtime_images ='[
     "ID": "ruby",
     "compiled": false,
     "versions": [
+      {
+        "name": "ruby23",
+        "version": "2.3",
+        "runtimeImage": "kubeless/ruby@sha256:67870b57adebc4dc749a8a19795da801da2d05fc6e8324168ac1b227bb7c77f7",
+        "initImage": "bitnami/ruby:2.3"
+      },
       {
         "name": "ruby24",
         "version": "2.4",
-        "runtimeImage": "kubeless/ruby@sha256:01665f1a32fe4fab4195af048627857aa7b100e392ae7f3e25a44bd296d6f105",
+        "runtimeImage": "kubeless/ruby@sha256:aaa9c7f3dfd4f866a527c04171c32dae2efa420d770a6af9c517771137ab4011",
         "initImage": "bitnami/ruby:2.4"
+      },
+      {
+        "name": "ruby25",
+        "version": "2.5",
+        "runtimeImage": "kubeless/ruby@sha256:577e35724996ba340ff0a18366bce99586b0be58e4d27fa3e8038f977caf1559",
+        "initImage": "bitnami/ruby:2.5"
       }
     ],
     "depName": "Gemfile",