test Solaris CI

Author: psumbera

.github/actions/solaris/action.yml

@@ -19,7 +19,7 @@ runs:
         # https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=269889
         prepare: |
           cd $GITHUB_WORKSPACE
-          pkg install bison re2c
+          pkg install bison iconv re2c
 
           OPCACHE_TLS_TESTS_DEPS="gcc"