Scala 3.0.0 (#144)

looks like findutils is still required for scala 3.0.0 final
see scala/scala3#11989

Author: francisdb

.github/workflows/build.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        scalaVersion: ['2.12.13', '2.13.5', '3.0.0-RC3']
+        scalaVersion: ['2.12.13', '2.13.5', '3.0.0']
         javaTag: ['8u282', '11.0.10', '16', '11.0.10-oraclelinux8', 'graalvm-ce-21.1.0-java11', 'graalvm-ce-21.1.0-java8']
         include:
           - javaTag: '8u282'

oracle/Dockerfile

@@ -19,6 +19,7 @@ ARG GROUP_ID
 ENV GROUP_ID ${GROUP_ID:-1001}
 
 # Install findutils since find is required for scala 3
+# TODO Remove once this has been released: https://github.com/lampepfl/dotty/issues/11989
 RUN microdnf install findutils
 
 # Install sbt