how-to install linux enhancements (#35)

* add dummy linux-main

* how-to install in linux - script

Author: miguelangel-dev

Documentation.app/Contents/MacOS/Quick start.playground/Pages/Installation guide.xcplaygroundpage/Contents.swift

@@ -29,8 +29,7 @@
  | grep -oP '"tag_name": "\K(.*)(?=")' \
  | xargs -I {} wget -O - https://github.com/bow-swift/bow-openapi/archive/{}.tar.gz \
  | tar xz \
- && cd bow-openapi-* \
- && sudo make linux
+ && sudo make linux -C bow-openapi-*
  ```
 
  > It will install the last stable version.

Makefile

@@ -26,7 +26,7 @@ xcode: macos fixtures
 install:
 		@rm -rf ./Tests/Fixtures/FixturesAPI
 	 	@tar -xvf ./Tests/Fixtures/FixturesAPI.tar.gz -C ./Tests/Fixtures/
-		@swift build --disable-sandbox --configuration release --build-path $(BUILD_PATH)/build
+		@swift build --disable-sandbox --enable-test-discovery --configuration release --build-path $(BUILD_PATH)/build
 		@install $(BUILD_PATH)/build/release/$(TOOL_NAME) $(PREFIX_BIN)/$(TOOL_NAME)
 		@cp -R ./Templates $(RESOURCES_PATH)
 		@cp ./Tests/Fixtures/petstore.yaml $(RESOURCES_PATH)

README.md

@@ -48,11 +48,10 @@ brew install bow-openapi
 
 ```bash
 curl -s https://api.github.com/repos/bow-swift/bow-openapi/releases/latest \
-| grep -oP '"tag_name": "\K(.*)(?=")' \
-| xargs -I {} wget -O - https://github.com/bow-swift/bow-openapi/archive/{}.tar.gz \
-| tar xz \
-&& cd bow-openapi-* \
-&& sudo make linux
+ | grep -oP '"tag_name": "\K(.*)(?=")' \
+ | xargs -I {} wget -O - https://github.com/bow-swift/bow-openapi/archive/{}.tar.gz \
+ | tar xz \
+ && sudo make linux -C bow-openapi-*
 ```
 
 > It will install the last stable version.