Generate code at first, then run test to detect CI failure easily

.github/workflows/php-checks.yml

@@ -25,6 +25,28 @@ jobs:
         with:
           php-version: ${{ matrix.php }}
 
+      - name: Install openapi-generator-cli
+        run: echo "OPENAPI_GENERATOR_VERSION=6.6.0" >> $GITHUB_ENV
+      - uses: actions/cache@v3
+        id: openapi-generator-cache
+        env:
+          cache-name: openapi-generator-cache
+        with:
+          path: ~/bin/openapitools
+          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ env.OPENAPI_GENERATOR_VERSION }}
+      - if: steps.openapi-generator-cache.outputs.cache-hit != 'true'
+        run: |
+          mkdir -p ~/bin/openapitools
+          curl https://raw.githubusercontent.com/OpenAPITools/openapi-generator/master/bin/utils/openapi-generator-cli.sh > ~/bin/openapitools/openapi-generator-cli
+          chmod u+x ~/bin/openapitools/openapi-generator-cli
+          export PATH=$PATH:~/bin/openapitools/
+          OPENAPI_GENERATOR_VERSION=${{ env.OPENAPI_GENERATOR_VERSION }} openapi-generator-cli version
+
+      - name: Generate code
+        run: |
+          export PATH=$PATH:~/bin/openapitools/
+          bash tools/gen-oas-client.sh
+
       - name: Get Composer Cache Directory
         id: composer-cache
         run: |
@@ -39,7 +61,7 @@ jobs:
 
       - name: Install dependencies with Composer
         uses: ramsey/composer-install@v2
-        
+
       - name: Check copyrights
         if: matrix.analysis
         run: bash tools/check_copyright.sh