Remove the cabal path

Was causing CI build failure due to missing BUILD env var for nightly
pipelines.

Author: snoyberg

.azure/azure-linux-template.yml

@@ -36,23 +36,6 @@ jobs:
           ./etc/scripts/get-hlint.sh
           export PATH="$(pwd)"/hlint:$PATH
           ;;
-        cabal)
-          sudo add-apt-repository -y ppa:hvr/ghc
-          sudo apt-get update
-          sudo apt-get install cabal-install-$CABALVER ghc-$GHCVER
-          # See note here: https://github.com/haskell-CI/haskell-ci#alex--happy-with-ghc--78
-          if [ "$GHCVER" = "head" ] || [ "${GHCVER%.*}" = "7.8" ] || [ "${GHCVER%.*}" = "7.10" ]; then
-            sudo apt-get install happy-1.19.4 alex-3.1.3
-            export PATH=/opt/alex/3.1.3/bin:/opt/happy/1.19.4/bin:$PATH
-          else
-            sudo apt-get install happy alex
-          fi
-          export PATH=$HOME/.local/bin:/opt/ghc/$GHCVER/bin:/opt/cabal/$CABALVER/bin:$PATH
-          cabal --version
-          cabal update
-          PACKAGES=$(stack --install-ghc query locals | grep '^ *path' | sed 's@^ *path:@@')
-          cabal install --only-dependencies --enable-tests --enable-benchmarks --force-reinstalls --ghc-options=-O0 --reorder-goals --max-backjumps=-1 $CABALARGS $PACKAGES
-          ;;
         *)
           export PATH=$HOME/.local/bin:$PATH
           stack --install-ghc $ARGS test --bench --only-dependencies

etc/scripts/ci-setup.sh

@@ -23,18 +23,3 @@ if [ `uname` = "Darwin" ]; then
 else
   travis_retry fetch_stack_linux
 fi
-
-case "$BUILD" in
-  stack)
-    # However, we only need stack to download GHC for stack builds.
-    travis_retry stack --no-terminal setup;
-    ;;
-  cabal)
-mkdir -p $HOME/.cabal
-cat > $HOME/.cabal/config <<EOF
-remote-repo: hackage.haskell.org:http://hackage.fpcomplete.com/
-remote-repo-cache: $HOME/.cabal/packages
-jobs: \$ncpus
-EOF
-;;
-esac