Validate openapi spec file in github workflow

Author: rocketniko

.github/workflows/openapi.yml

@@ -0,0 +1,23 @@
+name: Validate openapi spec
+on:
+  push:
+    branches:
+      - main
+    tags: ['[0-9]*']
+  pull_request:
+    branches:
+      - main
+      - 'release-*'
+
+jobs:
+  validate:
+    name: Validate
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: Validate
+      shell: bash
+      run: |
+        docker run --rm -v "${PWD}:/local" \
+            openapitools/openapi-generator-cli validate \
+            -i /local/crates/server/openapi.yaml