Allow compiling stdLib213 with community-build/run

Author: abgruszecki

community-build/test/scala/dotty/communitybuild/readme.md renamed to community-build/README.md

@@ -14,4 +14,5 @@ To add your project to the community build you can follow these steps:
 2. Open a PR against this repo that:
      - Adds your project as a new git submodule
        - `git submodule add https://github.com/lampepfl/XYZ.git community-build/community-projects/XYZ`
+     - Add the project to [projects.scala](https://github.com/lampepfl/dotty/blob/master/community-build/src/scala/dotty/communitybuild/projects.scala)
      - Adds a test in [CommunityBuildTest.scala](https://github.com/lampepfl/dotty/blob/master/community-build/test/scala/dotty/communitybuild/CommunityBuildTest.scala)

community-build/src/scala/dotty/communitybuild/Main.scala

@@ -0,0 +1,13 @@
+package dotty.communitybuild
+
+object Main {
+  /** Builds stdlib.
+   *
+   *  Output is available in build/pack/lib directory in stdlib project.
+   *
+   *  In the future, we allow building different projects based on arguments,
+   *  but for now stdlib is the only usecase.
+   */
+  def main(args: Array[String]): Unit =
+    projects.stdLib213.publish()
+}

community-build/src/scala/dotty/communitybuild/projects.scala

@@ -223,8 +223,9 @@ object projects:
 
   lazy val stdLib213 = SbtCommunityProject(
     project       = "stdLib213",
+    extraSbtArgs  = List("-Dscala.build.compileWithDotty=true"),
     sbtTestCommand   = """;set scalacOptions in Global += "-Yerased-terms" ;library/compile""",
-    extraSbtArgs  = List("-Dscala.build.compileWithDotty=true")
+    sbtPublishCommand = """;set scalacOptions in Global += "-Yerased-terms" ;set publishArtifact in (library, Compile, packageDoc) := false ;library/publishLocal""",
   )
 
   lazy val shapeless = SbtCommunityProject(