docs:add release GitHub Action.

.github/workflows/release.yml

@@ -0,0 +1,27 @@
+name: Release
+
+on:
+  release:
+    types: [ published ]
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up JDK 17
+        uses: actions/setup-java@v3
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+          server-id: nexus-releases
+          server-username: MAVEN_USERNAME
+          server-password: MAVEN_PASSWORD
+
+      - name: Publish package
+        env:
+          MAVEN_USERNAME: ${{ secrets.OSSRH_USERNAME }}
+          MAVEN_PASSWORD: ${{ secrets.OSSRH_TOKEN }}
+        run: |
+          cat <(echo -e "${{ secrets.OSSRH_GPG_SECRET_KEY }}") | gpg --batch --import;
+          mvn clean deploy -U -P release -Dgpg.passphrase=${{ secrets.OSSRH_GPG_SECRET_KEY_PASSWORD }} -DskipTests

CHANGELOG.md

@@ -7,3 +7,4 @@
 - Refactoring: Refactor Circuitbreaker ut.
 - refactor:refactor rpc enhancement.
 - feat:refactor SDKContext as static.
+- docs:add release GitHub Action.

spring-cloud-tencent-polaris-context/src/main/java/com/tencent/cloud/polaris/context/PolarisSDKContextManager.java

@@ -111,8 +111,10 @@ public class PolarisSDKContextManager {
 					assemblyAPI = null;
 				}
 
-				sdkContext.destroy();
-				sdkContext = null;
+				if (Objects.nonNull(sdkContext)) {
+					sdkContext.destroy();
+					sdkContext = null;
+				}
 				LOG.info("Polaris SDK context is destroyed.");
 			}
 			catch (Throwable throwable) {