library/perl: Set an always-accessible WORKDIR

Ensure that running this image with a non-root user will work, even when
not customizing `WORKDIR`.

https://github.com/Perl/docker-perl/issues/72

library/perl

@@ -1,7 +1,7 @@
 Maintainers: Peter Martini <[email protected]> (@PeterMartini),
              Zak B. Elep <[email protected]> (@zakame)
 GitRepo: https://github.com/perl/docker-perl.git
-GitCommit: bad811d7db8abc4f7b612f6a7b4c7890ff44f399
+GitCommit: 61f3aae15f583754767f4d5a969d609f1facdeb4
 Architectures: amd64, arm32v7, arm64v8, i386, ppc64le, s390x
 
 Tags: latest, 5, 5.30, 5.30.0, 5-buster, 5.30-buster, 5.30.1-buster