Test Haskell client in drone.io (#3791)

* test haskell in drone.io

* fix docker image

* trigger alert

* Revert "trigger alert"

This reverts commit 9637b5c6a7.

CI/.drone.yml

@@ -2,6 +2,11 @@ kind: pipeline
 name: default
 
 steps:
+# test haskell client
+- name: haskell-client-test
+  image: haskell:8.6.5
+  commands:
+  - (cd samples/client/petstore/haskell-http-client/ && stack --install-ghc --no-haddock-deps haddock --fast && stack test --fast)
 # test Dart 2.x petstore client
 - name: dart2x-test
   image: google/dart

samples/client/petstore/haskell-http-client/stack.yaml.lock

@@ -1,19 +0,0 @@
-# This file was autogenerated by Stack.
-# You should not edit this file by hand.
-# For more information, please see the documentation at:
-#   https://docs.haskellstack.org/en/stable/lock_files
-
-packages:
-- completed:
-    hackage: katip-0.8.3.0@sha256:8a67c0aec3ba1f0eabcfae443cb909e4cf9405e29bac99ccf1420f1f1bbda9c4,4097
-    pantry-tree:
-      size: 1140
-      sha256: cad8c67256ec85819309d77bdcbc15b67885940ef76f2b850c8be20c2efd0149
-  original:
-    hackage: katip-0.8.3.0
-snapshots:
-- completed:
-    size: 523878
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/14/3.yaml
-    sha256: 470c46c27746a48c7c50f829efc0cf00112787a7804ee4ac7a27754658f6d92c
-  original: lts-14.3