update drone file (#299)

.drone.yml

@@ -54,6 +54,7 @@ steps:
     DOCKER_PASSWORD:
       from_secret: gts_docker_password
   commands:
+  - git fetch --tags
   - /go/dockerlogin.sh
   - goreleaser release --rm-dist --snapshot
   - docker push superseriousbusiness/gotosocial:latest
@@ -79,6 +80,7 @@ steps:
     GITHUB_TOKEN:
       from_secret: github_token
   commands:
+  - git fetch --tags
   - /go/dockerlogin.sh
   - goreleaser release --rm-dist
   when:
@@ -113,6 +115,6 @@ trigger:
 
 ---
 kind: signature
-hmac: 8c39ebbac5e9cf4abde546a2b6b8b99a863804969474a5c8fc11f394f415e0ac
+hmac: aa44c4655421fb0ed3141b8d7255a9a240dd4312244081d9e95929c4a196fd92
 
 ...