chore: sign the released scala nightlies now (#23931)

Closes #23930

Author: hamzaremmal

.github/workflows/release-maven-artifacts.yml

@@ -22,8 +22,14 @@ jobs:
           java-version: 17
           cache: 'sbt'
       - uses: sbt/setup-sbt@v1
+      - name: Import Scala PGP Key
+        uses: crazy-max/ghaction-import-gpg@v6
+        with:
+          gpg_private_key: ${{ secrets.SCALA_PGP_KEY }}
+          passphrase     : ${{ secrets.SCALA_PGP_PASSPHRASE }}
+          fingerprint    : ${{ vars.SCALA_PGP_FINGERPRINT }}
       - name: Publish Artifacts to the Maven Repository
-        run : sbt scala3-bootstrapped-new/publish
+        run : sbt scala3-bootstrapped-new/publishSigned
         env:
           MAVEN_REPOSITORY_USER : ${{ secrets.MAVEN_REPOSITORY_USER }}
           MAVEN_REPOSITORY_TOKEN: ${{ secrets.MAVEN_REPOSITORY_TOKEN }}

project/Build.scala

@@ -3,7 +3,6 @@ import java.nio.file._
 import Process._
 import Modes._
 import ScaladocGeneration._
-import com.jsuereth.sbtpgp.PgpKeys
 import sbt.Keys.*
 import sbt.*
 import sbt.nio.FileStamper
@@ -335,8 +334,6 @@ object Build {
         password <- sys.env.get("SONATYPE_PW")
       } yield Credentials("Sonatype Nexus Repository Manager", "central.sonatype.com", username, password)
     ).toList,
-    PgpKeys.pgpPassphrase := sys.env.get("PGP_PW").map(_.toCharArray()),
-    PgpKeys.useGpgPinentry := true,
 
     // Do not cut off the bottom of large stack traces (default is 1024)
     javaOptions ++= "-XX:MaxJavaStackTraceDepth=1000000" :: agentOptions,