dump cpanm log on fail, min Perl 5.16

Author: mohawk2

.github/workflows/test.yml

@@ -26,7 +26,7 @@ jobs:
 
         # All supported Perl versions except latest.
         perl: [
-          '5.10', '5.12', '5.14', '5.16', '5.18',
+          '5.16', '5.18',
           '5.20', '5.22', '5.24', '5.26', '5.28',
           '5.30', '5.32'
         ]
@@ -76,7 +76,7 @@ jobs:
 
       - run: perl -v
 
-      - run: cpanm --installdeps -n .
+      - run: cpanm --installdeps -n . || ( cat ~/.cpanm/build.log && false )
 
       - if: ${{ matrix.cover }}
         run: cpanm -n Devel::Cover::Report::Coveralls