MOBILE-3745 github: Manually run migration checks

.github/workflows/migration.yml

@@ -0,0 +1,18 @@
+name: Migration checks
+
+on: workflow_dispatch
+
+jobs:
+  checks:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js
+      uses: actions/setup-node@v1
+      with:
+        node-version: '12.x'
+    - run: npm ci
+    - run: result=$(find src -type f -iname '*.html' -exec sh -c 'cat {} | tr "\n" " " | grep -Eo "class=\"[^\"]+\"[^>]+class=\"" ' \; | wc -l); test $result -eq 0
+    - run: npx tslint -c ionic-migration.json -p tsconfig.json

.github/workflows/testing.yml

@@ -14,9 +14,7 @@ jobs:
       with:
         node-version: '12.x'
     - run: npm ci
-    - run: result=$(find src -type f -iname '*.html' -exec sh -c 'cat {} | tr "\n" " " | grep -Eo "class=\"[^\"]+\"[^>]+class=\"" ' \; | wc -l); test $result -eq 0
     - run: npm run lint
-    - run: npx tslint -c ionic-migration.json -p tsconfig.json
     - run: npm run test:ci
     - run: npm run build:prod
     - run: result=$(npx check-es-compat www/*.js 2> /dev/null | grep -v -E "Array\.prototype\.includes|Promise\.prototype\.finally|String\.prototype\.(matchAll|trimRight)|globalThis" | grep -Po "(?<=error).*?(?=\s+ecmascript)" | wc -l); test $result -eq 0