Build Haddock deps as well

Resolves #57

Author: quchen

.github/workflows/haskell.yml

@@ -24,7 +24,9 @@ jobs:
         env:
           cache-name: cache-stack
         with:
-          path: ~/.stack
+          path: |
+            ~/.stack
+            .stack-work
           key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/*.stack') }}
           restore-keys: |
             ${{ runner.os }}-build-${{ env.cache-name }}-
@@ -44,14 +46,11 @@ jobs:
           stack-arguments: --ghc-options -Werror
 
       - name: "Haddock: build"
-        # Not sure why it’s not $(stack path --local-doc-root) but the generated
-        # directory isn’t right, reproducible locally. Haddock reports
-        # a different one at the end of its run, and *that* is where the
-        # documentation is.
         run: |
+          stack haddock --fast --test --no-run-tests --only-dependencies
           stack haddock --fast --test --no-run-tests --no-haddock-deps
-          echo "haddock_files=$(stack path --local-install-root)/doc/" >> "$GITHUB_ENV"
-          echo "stack path --local-install-root: $(stack path --local-install-root)"
+          echo "haddock_files=$(stack path --local-doc-root)/" >> "$GITHUB_ENV"
+          echo "stack path --local-doc-root: $(stack path --local-doc-root)"
 
       - name: "Haddock: package"
         uses: actions/upload-pages-artifact@v1 # This will automatically upload an artifact from the '/_site' directory