Haskell CI: switch off testing for GHC 9.2 and below

Reason: haskell/cabal#8554
Cabal-3.8.1.0 does not work with ghc < 9.4 needed by doctest-parallel

Author: andreasabel

.github/workflows/haskell-ci.yml

@@ -85,7 +85,7 @@ jobs:
           echo "CABAL=$HOME/.ghcup/bin/cabal-3.6.2.0 -vnormal+nowrap" >> "$GITHUB_ENV"
           HCNUMVER=$(${HC} --numeric-version|perl -ne '/^(\d+)\.(\d+)\.(\d+)(\.(\d+))?$/; print(10000 * $1 + 100 * $2 + ($3 == 0 ? $5 != 1 : $3))')
           echo "HCNUMVER=$HCNUMVER" >> "$GITHUB_ENV"
-          echo "ARG_TESTS=--enable-tests" >> "$GITHUB_ENV"
+          if [ $((HCNUMVER >= 90400)) -ne 0 ] ; then echo "ARG_TESTS=--enable-tests" >> "$GITHUB_ENV" ; else echo "ARG_TESTS=--disable-tests" >> "$GITHUB_ENV" ; fi
           echo "ARG_BENCH=--enable-benchmarks" >> "$GITHUB_ENV"
           echo "HEADHACKAGE=false" >> "$GITHUB_ENV"
           echo "ARG_COMPILER=--$HCKIND --with-compiler=$HC" >> "$GITHUB_ENV"
@@ -167,9 +167,7 @@ jobs:
           echo "    ghc-options: -Werror=missing-methods" >> cabal.project
           cat >> cabal.project <<EOF
           EOF
-          cat >> cabal.project.local <<EOF
-          constraints: ghc installed
-          EOF
+          $HCPKG list --simple-output --names-only | perl -ne 'for (split /\s+/) { print "constraints: $_ installed\n" unless /^(Cabal|hackage-server|parsec|text)$/; }' >> cabal.project.local
           cat cabal.project
           cat cabal.project.local
       - name: dump install plan
@@ -194,7 +192,7 @@ jobs:
           $CABAL v2-build $ARG_COMPILER $ARG_TESTS $ARG_BENCH all --write-ghc-environment-files=always
       - name: tests
         run: |
-          $CABAL v2-test $ARG_COMPILER $ARG_TESTS $ARG_BENCH all --test-show-details=direct
+          if [ $((HCNUMVER >= 90400)) -ne 0 ] ; then $CABAL v2-test $ARG_COMPILER $ARG_TESTS $ARG_BENCH all --test-show-details=direct ; fi
       - name: cabal check
         run: |
           cd ${PKGDIR_hackage_server} || false

cabal.haskell-ci

@@ -1,11 +1,8 @@
 branches: master ci*
 
-installed: -all +ghc
--- installed: +all -Cabal -text -parsec
-
--- -- irc-channels works with GHA, but why send to a channel
--- -- when one can subscribe to github notifications?
--- irc-channels: irc.libera.chat#hackage
+installed: +all -Cabal -text -parsec
+-- Did not help to salvage ghc-9.2 and below:
+-- installed: -all +ghc
 
 -- Does not work with GHA:
 -- -- allow failures with ghc-7.6 and ghc-7.8
@@ -20,3 +17,8 @@ apt: libbrotli-dev
 -- even though we don't define any library.
 haddock-components: all
   -- since haskell-ci 0.15.20220822
+
+tests: >= 9.4
+  -- parallel-doctest uses the ghc package
+  -- and thus does not build with Cabal-3.8.1.0 below GHC 9.4
+  -- See: https://github.com/haskell/cabal/issues/8554