ci: configure cache for haskell stack

1 files changed, 6 insertions, 0 deletions

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index aef142b..d877ffc 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -30,13 +30,19 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/cache@v2
+        with:
+          path: ~/.stack
+          key: compiler-${{ runner.os }}-${{ hashFiles('compiler/stack.yaml') }}
       - uses: haskell/actions/setup@v1
         with:
           ghc-version: 8.10.4
           enable-stack: true
       - name: Build Haskell Stack project
         working-directory: compiler
+        shell: bash
         run: |
+          STACK_ROOT=~/.stack  # make it the same on all platforms
           stack setup --no-terminal
           stack build --no-terminal
           stack install --local-bin-path dist