Merge pull request #5677 from livarcocc/more_docker_variables

Adding DropSuffix and ReleaseSuffix as enviroment variables passed down to docker.

scripts/dockerrun.sh

@@ -134,5 +134,7 @@ docker run $INTERACTIVE -t --rm --sig-proxy=true \
     -e CHECKSUM_STORAGE_CONTAINER \
     -e CLIBUILD_SKIP_TESTS \
     -e CommitCount \
+    -e DropSuffix \
+    -e ReleaseSuffix \
     $DOTNET_BUILD_CONTAINER_TAG \
     $BUILD_COMMAND "$@"