Fix bin scripts

bin/build_local.sh

@@ -1,3 +1,5 @@
+#!/bin/bash
+
 pushd $(dirname "$0")/.. # run from root dir
 
 set -e

bin/test_coverage.sh

@@ -1,9 +1,10 @@
+#!/bin/bash
+
 pushd $(dirname "$0")/.. # run from root dir
 
 rm -rf ./coverage
 mkdir ./coverage/
 
-chmod 777 ./target/pilgrim_coverage
 go test --cover -coverpkg=./internal/pilgrim... -covermode=count -coverprofile=./coverage/cover.out ./...
 
 go tool cover -html=./coverage/cover.out