Add git hooks for formatting and linting

Author: tchoutri

.githooks/pre-commit

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+if which fourmolu > /dev/null ; then
+  find app test src -name '*.hs' -exec fourmolu --mode check {} +
+else
+  echo "Fourmolu not found, aborting."
+  exit 1
+fi
+
+if which hlint > /dev/null ; then
+  hlint app test src
+else
+  echo "HLint not found, aborting."
+  exit 1
+fi

Makefile

@@ -1,3 +1,6 @@
+init: ## Set up git hooks properly - needs calling once when cloning the repo
+	@git config core.hooksPath .githooks
+
 start: ## Start flora-server
 	@cabal run exe:flora-server