Add stack.yaml file (#463)

* Add stack.yaml file to containers. `stack setup` fails due to ChasingBottoms missing from Stackage We default to lts-9.20 because lts-10.0 is currently not supported by many development tools (such as intero) because ghc-mod does not yet support GHC 8.2 (DanielG/ghc-mod#900). This was tested and works with resolvers lts-10.0 and lts-9.20. Using older resolvers <=lts-7.24 causes a conflict with the package ranges specified in containers.cabal. * Remove `stack init` step in CONTRIBUTING.md.
haskell · Dec 28, 2017 · e631b6b · e631b6b
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -34,7 +34,6 @@ cabal bench
 Minimum stack version: 1.6.1
 
 ```
-stack init   # If you haven't previously initialized stack
 stack build
 stack test
 stack bench

diff --git a/stack.yaml b/stack.yaml
@@ -0,0 +1,11 @@
+flags: {}
+packages:
+- '.'
+
+### Uncoment the resolver you want to use and re-run `stack build/test/bench`.
+# resolver: lts-10.0
+resolver: lts-9.20
+
+### ChasingBottoms is only in Stackage snapshots lts-7.24 and below.
+extra-deps:
+- ChasingBottoms-1.3.1.3