Merge pull request #41 from input-output-hk/mgalazyn/fix/github-stylish

Fix stylish haskell in github action workflow

.github/workflows/check-stylish-haskell.yml

@@ -48,7 +48,7 @@ jobs:
 
     - uses: actions/checkout@v3
 
-    - name: Run stylish-haskell over all Haskell files
+    - name: Run stylish-haskell over all Haskell files (always succeeds)
       run: |
         git add .
         git stash
@@ -66,7 +66,7 @@ jobs:
         git add .
         git stash
         git fetch origin ${{ github.base_ref }} --unshallow
-        for x in $(git diff --name-only ${{ github.base_ref }} HEAD ${{ env.STYLISH_HASKELL_PATHS }}); do
+        for x in $(git diff --name-only origin/${{ github.base_ref }}..HEAD ${{ env.STYLISH_HASKELL_PATHS }}); do
           if [ "${x##*.}" == "hs" ]; then
             stylish-haskell -i $x
           fi