Update snapshot.yml

Author: perplexhub

.github/workflows/snapshot.yml

@@ -10,7 +10,9 @@ jobs:
   build:
     runs-on: ubuntu-latest
     if: "!contains(github.event.head_commit.message, '[maven-release-plugin] prepare')"
-
+    env:
+      MAVEN_REPO_USERNAME: ${{ secrets.nexus_username }}
+      MAVEN_REPO_PASSWORD: ${{ secrets.nexus_password }}
     steps:
     - uses: actions/checkout@v2
     - name: Set up JDK 17