Fix publish github signed apk CI step (again)

.circleci/config.yml

@@ -118,13 +118,13 @@ jobs:
             - ultrasonic-*.apk*
   publish_github_signed_apk:
     docker:
-      - image: cimg/go
+      - image: cimg/go:1.18
     steps:
       - attach_workspace:
           at: /tmp/ultrasonic-release
       - run:
           name: install ghr
-          command: go get -v github.com/tcnksm/ghr
+          command: go install -v github.com/tcnksm/ghr@latest
       - run:
           name: publish release on github tag
           command: ghr -u ${CIRCLE_PROJECT_USERNAME} -r ${CIRCLE_PROJECT_REPONAME} ${CIRCLE_TAG} /tmp/ultrasonic-release