Fix release workflow

Author: mikhail-vl

.github/workflows/main.yml

@@ -118,6 +118,7 @@ jobs:
           echo "::set-output name=checksum::$(cat ./${{ steps.metadata.outputs.archive-checksum }} | cut -d' ' -f1)"
 
       - name: Lint plugin
+        continue-on-error: true
         run: |
           git clone https://github.com/grafana/plugin-validator
           pushd ./plugin-validator/pkg/cmd/plugincheck