ci: extract + fix await-published logic

.github/workflows/POST_RELEASE.yml

@@ -19,23 +19,9 @@ jobs:
     - name: Set TAG
       run: echo "TAG=$(git describe --tags --abbrev=0)" >> $GITHUB_ENV
     - name: Wait for published
-      run: |
-        i=0
-        pkg="bpmn-js@${{ env.TAG }}"
-
-        until [ $i -gt 10 ]
-        do
-          echo "Checking for $pkg in npm registry..."
-
-          info=$(npm info $pkg)
-          if [[ "$info" != "" ]]; then
-            echo "Found."
-            break
-          fi
-
-          ((i++))
-          sleep 15s
-        done
+      env:
+        PKG: 'bpmn-js@${{ env.TAG }}'
+      run: tasks/stages/await-published
     - name: Use Node.js
       uses: actions/setup-node@v2
       with:

tasks/stages/await-published

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+set -eo pipefail
+shopt -s inherit_errexit nullglob
+
+i=0
+pkg="$PKG"
+until [ $i -gt 10 ]
+do
+  echo "Checking for $pkg in npm registry ($((i+1))/10)"
+  info=$(npm info $pkg)
+  if [[ "$info" != "" ]]; then
+    echo "Found."
+    break
+  fi
+
+  i=$((var+1))
+  sleep 15s
+done