add lint workflow

.gitea/workflows/lint.yaml

@@ -0,0 +1,24 @@
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
+
+name: lint
+
+on:
+  - push
+  - workflow_dispatch
+
+defaults:
+  run:
+    shell: sh
+
+jobs:
+  lint:
+    runs-on: alpine-3.16
+    steps:
+      - name: checkout source
+        uses: actions/checkout@v3
+
+      - name: phpunit
+        run: php81 ./vendor/bin/phpunit
+
+      - name: phpstan
+        run: php81 -d memory_limit=-1 ./vendor/bin/phpstan --memory-limit=2G