add github release to .drone.yml

.drone.yml

@@ -46,7 +46,7 @@ steps:
     commands:
       - echo "exa ${DRONE_TAG} - built@$(date '+%FT%TZ') [Drone ${DRONE_SYSTEM_VERSION}]" > ./release_note
       - cat ./release_note
-  - name: publish release
+  - name: publish gitea release
     image: plugins/gitea-release
     settings:
       api_key:
@@ -61,6 +61,21 @@ steps:
       file_exists: "skip"
       when:
         event: tag
+  - name: publish github release
+    image: plugins/github-release
+    settings:
+      api_key:
+        from_secret: GITHUB_KEY
+      files:
+        - ./exa-${DRONE_TAG}.txz
+      checksum:
+        - md5
+      title: ${DRONE_TAG}
+      note: ./release_note
+      file_exists: "skip"
+      when:
+        event: tag
+
   - name: slack
     image: plugins/slack
     settings: