ci: Fix docs tarball

haskell-ci by default passes --haddock-all to cabal v2-haddock, which
builds docs for all components and the …-docs.tar.gz tarball ends up
containing the docs for the last component, which happens to be tests.
We need the tarball to contain the library docs, for upload to Hackage.

Fixes: 25a4ed69da9c ("ci: Bump haskell-ci")

.github/workflows/haskell-ci-hackage.patch

@@ -49,8 +49,8 @@ set in GitHub repository secrets.
            ${CABAL} -vnormal check
        - name: haddock
          run: |
--          $CABAL v2-haddock --haddock-all $ARG_COMPILER --with-haddock $HADDOCK $ARG_TESTS $ARG_BENCH all
-+          $CABAL v2-haddock --haddock-all $ARG_COMPILER --with-haddock $HADDOCK $ARG_TESTS $ARG_BENCH --haddock-for-hackage --builddir $GITHUB_WORKSPACE/haddock all
+-          $CABAL v2-haddock $ARG_COMPILER --with-haddock $HADDOCK $ARG_TESTS $ARG_BENCH all
++          $CABAL v2-haddock $ARG_COMPILER --with-haddock $HADDOCK $ARG_TESTS $ARG_BENCH --haddock-for-hackage --builddir $GITHUB_WORKSPACE/haddock all
        - name: unconstrained build
          run: |
            rm -f cabal.project.local

.github/workflows/haskell-ci.yml

@@ -239,7 +239,7 @@ jobs:
           ${CABAL} -vnormal check
       - name: haddock
         run: |
-          $CABAL v2-haddock --haddock-all $ARG_COMPILER --with-haddock $HADDOCK $ARG_TESTS $ARG_BENCH --haddock-for-hackage --builddir $GITHUB_WORKSPACE/haddock all
+          $CABAL v2-haddock $ARG_COMPILER --with-haddock $HADDOCK $ARG_TESTS $ARG_BENCH --haddock-for-hackage --builddir $GITHUB_WORKSPACE/haddock all
       - name: unconstrained build
         run: |
           rm -f cabal.project.local

cabal.haskell-ci

@@ -12,3 +12,6 @@ raw-project
   optimization: False
   package xmonad
     flags: +pedantic
+
+-- avoid --haddock-all which overwrites *-docs.tar.gz with tests docs
+haddock-components: libs