GitLab CI: Attempt to cache both ~/.stack and ./.stack-work

.gitlab-ci.yml

 image: league/haskell-stack:20180605
 
-# Here are two problems we're trying to solve with this before_script:
-# https://github.com/commercialhaskell/stackage/issues/3132
-# https://github.com/snoyberg/http-client/issues/292
-# https://github.com/commercialhaskell/stack/issues/2372#issuecomment-234113085
-# https://github.com/fpco/haskell-scratch/issues/2
-# The libnss3 seems to fix the network issue.
-
-# Also, we can't force stack to use system-ghc if its version doesn't
-# match what the resolver wants. So to download and install a GHC, we
-# need build-essential.
-
 before_script:
-  - echo USER IS $(whoami)
-  - echo HOME IS $HOME
-  - ls -l /
+  - mkdir -p /cache/root-stack
+  - ln -s /cache/root-stack /root/.stack
 
 build:
-  # For some reason, just `stack` uses the old version, so explicitly
-  # ask for the new one from ~/.local:
   script:
-    - echo Fake build
-    - echo PWD is $(pwd)
-    - mkdir .stack-work
-    - touch .stack-work/SAVED
+    - stack build
 
 cache:
   paths:

config/keter.yml

 # After you've edited this file, remove the following line to allow
 # `yesod keter` to build your bundle.
-user-edited: false
+user-edited: true
 
 # A Keter app is composed of 1 or more stanzas. The main stanza will define our
 # web application. See the Keter documentation for more information on
@@ -55,7 +55,7 @@ stanzas:
 
 # Use the following to automatically copy your bundle upon creation via `yesod
 # keter`. Uses `scp` internally, so you can set it to a remote destination
-# copy-to: user@host:/opt/keter/incoming/
+copy-to: liucs.net:tmp
 
 # You can pass arguments to `scp` used above. This example limits bandwidth to
 # 1024 Kbit/s and uses port 2222 instead of the default 22