fix(action): try gcc instead

the texlive-action uses the dumb `bash -o pipefail`, which makes
fallback impossible

Author: RadioNoiseE

.github/workflows/publ.yml

@@ -31,7 +31,7 @@ jobs:
               evangelion-jfm \
               xurl \
               silence
-            apk add clang || apk add gcc
+            apk add gcc
             mkdir ./public/batch >/dev/null 2>&1
             python3 make.py post
             python3 make.py batch