[WIP] Add CI to validate pipeline

Author: LecrisUT

.github/workflows/pipeline_linter.yml

@@ -0,0 +1,28 @@
+name: Pipeline-Linter
+
+on:
+  pull_request:
+    branches: [master]
+
+jobs:
+  syntax_check:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Check Jenkinsfile file
+        id: validate
+        uses: fjogeleit/http-request-action@v1
+        with:
+          url: https://osci-jenkins-1.ci.fedoraproject.org/pipeline-model-converter/validate
+          method: POST
+#          files: '{ "jenkinsfile" : "${{ github.workspace }}/Jenkinsfile" }'
+          file: ${{ github.workspace }}/Jenkinsfile
+      - name: Check validation result
+        run: |
+          echo "status=${{ steps.validate.outputs.status }}"
+          echo ${{ steps.validate.outputs.response }}
+          if [[ ! ${{ steps.validate.outputs.response }} =~ .*"successfully validated".* ]]; then
+            exit 1
+          fi