build(dev-build): add GitHub actions for dev builds (#24193)

.github/workflows/dev-build.yml

@@ -0,0 +1,18 @@
+name: 'Ionic Dev Build'
+
+on:
+  workflow_dispatch:
+
+jobs:
+  dev-build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 15.x
+      - name: Create Dev Build
+        run: npm run release.dev -- --skip-prompt
+        shell: bash
+        env:
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}