ci: github: fix ~/.stack caching

.github/workflows/ci.yml

@@ -8,7 +8,8 @@
 # https://help.github.com/en/actions/reference/virtual-environments-for-github-hosted-runners#supported-runners-and-hardware-resources
 # https://github.com/actions/cache
 # https://help.github.com/en/actions/configuring-and-managing-workflows/caching-dependencies-to-speed-up-workflows
-
+# https://github.com/sdras/awesome-actions
+# http://www.btellez.com/posts/triggering-github-actions-with-webhooks.html
 
 name: hledger default CI tests
 
@@ -25,7 +26,7 @@ jobs:
     strategy:
       matrix:
         # os runners: https://help.github.com/en/actions/reference/virtual-environments-for-github-hosted-runners#supported-runners-and-hardware-resources
-        os: [ubuntu-latest, macos-latest]  # not recognised:, windows-latest]
+        os: [ubuntu-latest, macos-latest]  # , windows-latest] # why not recognised ?? 
         # use this to specify what resolvers and ghc to use
         plan:
         # - { build: stack, resolver: "--resolver lts-9"  }    # ghc-8.0.2
@@ -59,11 +60,11 @@ jobs:
 
     # cf https://github.com/actions/cache/blob/master/examples.md#haskell---cabal
     - uses: actions/cache@v1
-      name: Cache ~/.stack-work
+      name: Cache ~/.stack
       with:
-        path: ~/.stack-work
-        key: ${{ runner.os }}-stack-work
-        #key: ${{ runner.os }}-${{ matrix.resolver }}-stack-work
+        path: ~/.stack
+        key: ${{ runner.os }}-stack
+        #key: ${{ runner.os }}-${{ matrix.resolver }}-stack
 
     - uses: actions/cache@v1
       name: Cache ~/.local/bin