Add perspective to the community build (#10750)

.gitmodules

@@ -177,3 +177,7 @@
 [submodule "community-build/community-projects/izumi-reflect"]
 	path = community-build/community-projects/izumi-reflect
 	url = https://github.com/dotty-staging/izumi-reflect.git
+[submodule "community-build/community-projects/perspective"]
+	path = community-build/community-projects/perspective
+	url = https://github.com/dotty-staging/perspective.git
+	branch = dotty/nightly

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

@@ -627,6 +627,14 @@ object projects:
     sbtPublishCommand = "publishLocal",
     dependencies = List(scalatest)
   )
+
+  lazy val perspective = SbtCommunityProject(
+    project = "perspective",
+    // No library with easy typeclasses to verify data against exist for Dotty, so no tests yet
+    // Until then I guess this mainly serves to check that it still compiles at all
+    sbtTestCommand = "dottyPerspectiveExamples/compile",
+    dependencies = List(cats)
+  )
 
 end projects
 
@@ -691,6 +699,7 @@ def allProjects = List(
   projects.scalaSTM,
   projects.scissLucre,
   projects.izumiReflect,
+  projects.perspective,
 )
 
 lazy val projectMap = allProjects.map(p => p.project -> p).toMap

community-build/test/scala/dotty/communitybuild/CommunityBuildTest.scala

@@ -148,6 +148,7 @@ class CommunityBuildTestB extends CommunityBuildTest:
   @Test def simulacrumScalafixAnnotations = projects.simulacrumScalafixAnnotations.run()
   @Test def verify = projects.verify.run()
   @Test def xmlInterpolator = projects.xmlInterpolator.run()
+  @Test def perspective = projects.perspective.run()
 
 end CommunityBuildTestB