Replace Stack with cabal-install on CI (#199)

Author: utdemir

.buildkite/pipeline.yml

@@ -4,8 +4,8 @@ steps:
       nix-shell --command ''
     timeout: 120
     key: "install-linear-ghc"
-  - label: "Run tests (Stack)"
+  - label: "Run tests (cabal-install)"
     command: |
-      nix-shell --pure --run 'stack --nix build --pedantic --test --bench --no-run-benchmarks'
+      nix-shell --pure --run 'cabal update; cabal test'
     timeout: 30
     depends_on: "install-linear-ghc"

cabal.project

@@ -2,6 +2,9 @@ packages: *.cabal
 
 allow-newer: all
 
+package linear-base
+  ghc-options: -Wall -Werror
+
 -- If you update below, make sure to also update stack.yaml too
 
 source-repository-package