Use CI config files from the remote centralized spot

Author: bocharsky-bw

.github/workflows/ci.yaml

@@ -0,0 +1,21 @@
+name: CI
+
+on:
+    pull_request: ~
+    push:
+        branches: ['main']
+    schedule:
+        - cron: '0 */12 * * *'
+
+jobs:
+    test:
+        uses: SymfonyCasts/.github/.github/workflows/phpunit.yaml@main
+
+    composer-validate:
+        uses: SymfonyCasts/.github/.github/workflows/composer-validate.yaml@main
+
+    cs:
+        uses: SymfonyCasts/.github/.github/workflows/php-cs-fixer.yaml@main
+
+    sca:
+        uses: SymfonyCasts/.github/.github/workflows/psalm.yaml@main