add Github CI for waiver syntax check, fix waivers

Signed-off-by: Jiri Jaburek <[email protected]>

.github/workflows/waivers-syntax-check.yaml

@@ -0,0 +1,25 @@
+name: Check conf/waivers syntax
+
+on:
+  pull_request:
+
+jobs:
+  # Build job
+  syntax-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Collect waivers
+        run: |
+            pwd
+            ls -l
+            ls -l -R
+            python3 <<'EOF'
+            import sys
+            from lib import waive
+            try:
+              list(waive.collect_waivers())
+              sys.exit(0)
+            except waive.WaiveParseError as e:
+              print(str(e))
+              sys.exit(1)
+            EOF