config.yml: Add Debian 10 (buster) support for current Perls

Prepare building buster-based images for Perl 5.26, 5.28, and 5.30.

Author: zakame

config.yml

@@ -55,11 +55,20 @@ releases:
 
   - version: 5.26.3
     sha256:  9ff35a613213f29ab53975141af6825ae7d4408895538cac0922e47ab92a1477
+    debian_release:
+      - stretch
+      - buster
 
   - version: 5.28.2
     sha256:  0b0189bfa4b2da20e899b4bdd746ac402e8f746a58e4fcf5516484157f2aab07
     type:    xz
+    debian_release:
+      - stretch
+      - buster
 
   - version: 5.30.0
     sha256:  ac501cad4af904d33370a9ea39dbb7a8ad4cb19bc7bc8a9c17d8dc3e81ef6306
     type:    xz
+    debian_release:
+      - stretch
+      - buster