add validate plugin step in ci

Author: BenediktSeidl

.github/workflows/ci.yml

@@ -62,6 +62,31 @@ jobs:
           name: checkmk-datasource-signed
           path: '${{ steps.build-signed.outputs.plugin_path }}'
 
+  validate-plugin:
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Download package from build job
+        uses: actions/download-artifact@v3
+        with:
+          name: checkmk-datasource-signed
+
+      - name: Setup Go environment
+        uses: actions/setup-go@v3
+        with:
+          go-version: '1.19'
+
+      - name: Install validator
+        run: |
+          git clone https://github.com/grafana/plugin-validator
+          pushd ./plugin-validator/pkg/cmd/plugincheck2
+          go install
+          popd
+
+      - name: Validate plugin
+        run: |
+          plugincheck2 -config ./plugin-validator/config/default.yaml checkmk-checkmk-datasource-*.zip
+
   e2e:
     runs-on: ubuntu-latest
     needs: build