Move webhook event check to workflow

.github/calcrom/webhook.sh

@@ -1,10 +1,5 @@
 #!/bin/bash -ex
 
-# Only run this script if it's the master branch build.
-if [[ "$GITHUB_REF" != "refs/heads/master" || "$GITHUB_EVENT_NAME" != "push" ]]; then
-  exit 0
-fi
-
 build_name=$1
 map_file=$build_name.map
 if [ ! -f $map_file ]; then

.github/workflows/build.yml

@@ -37,4 +37,6 @@ jobs:
         run: make -j${nproc} modern
 
       - name: Webhook
+        shell: bash
+        if: ${{ github.event_name == 'push' }}
         run: sh .github/calcrom/webhook.sh pokeemerald