Make shell scripts POSIX-compliant (#879)

Fixes #878

script/precompile_tasks

@@ -1,13 +1,9 @@
-#! /bin/bash
-
-# Exit if any subcommand fails
-set -e
-set -o pipefail
+#!/bin/sh -e
 
 # Precompile tasks if not in production and not in CI
 # Also allow skipping precompilation with an ENV var
 if [ "$LUCKY_ENV" != "production" ] && [ -z "$CI" ] && [ -z "$SKIP_LUCKY_TASK_PRECOMPILATION" ]; then
-    shards build && \
-    mkdir -p ../../bin && \
-    cp -r $(pwd)/bin $(pwd)/../..
+    shards build
+    mkdir -p ../../bin
+    cp -r $PWD/bin $PWD/../..
 fi

script/setup

@@ -1,8 +1,4 @@
-#! /bin/bash
-
-# Exit if any subcommand fails
-set -e
-set -o pipefail
+#!/bin/sh -eu
 
 if ! command -v docker-compose > /dev/null; then
     printf 'Docker and docker-compose are not installed.\n'

script/test

@@ -1,16 +1,12 @@
-#! /bin/bash
+#!/bin/sh -eu
 
-# Exit if any subcommand fails
-set -e
-set -o pipefail
 
 COMPOSE="docker-compose run --rm app"
 
 printf "\nrunning specs with 'crystal spec'\n\n"
 $COMPOSE crystal spec "$@"
 
-if [ $# -eq 0 ]
-then
+if [ $# = 0 ]; then
     printf "\nChecking that tasks build correctly\n\n"
     $COMPOSE shards build