Reverted CI workarounds and added new bin-compat baseline

Author: lefou

.github/workflows/build.yml

@@ -15,7 +15,6 @@ jobs:
         java-version: [8, 11]
 
     runs-on: ${{ matrix.os }}
-    continue-on-error: ${{ matrix.os == 'macos-latest' }}
 
     steps:
       - uses: actions/checkout@v3

build.sc

@@ -28,7 +28,7 @@ val scalaVersions = Seq(
 
 val scalaNativeVersions = scalaVersions.map((_, "0.4.5"))
 
-val backwardCompatibleVersions: Seq[String] = Seq()
+val backwardCompatibleVersions: Seq[String] = Seq("0.9.0")
 
 object Deps {
   val acyclic = ivy"com.lihaoyi:::acyclic:0.3.6"