Update readme

Author: jonaskello

README.md

@@ -9,13 +9,38 @@ This image is based on ubuntu becuase it is currently difficult to use alpine. S
 
 ## Command line
 
+`sentry-cli` is the entrypoint so you only need to specify parameters to it for `docker run`.
+
+Here is an example that just runs `sentry-cli` with the `--help` option.
+
  ```
  $ docker run -it --rm sentry-cli --help
  ```
 
  ## Gitlab
 
+The entrypoint needs to be blank in order for the script in gitlab to work. See [this issue](https://gitlab.com/gitlab-org/gitlab-runner/issues/2692#note_43591182) for more information.
+
+Here is an example that uploads soure-maps in gitlab to an on-premise sentry server:
+
 ```
-TODO!
+sentry:
+  stage: publish
+  image: 
+    name: dividab/sentry-cli:1.21.0
+    entrypoint: [""]
+  script:
+    - export SENTRY_URL=https://sentry.mydomain.com
+    - export SENTRY_AUTH_TOKEN=XXXXXXXX
+    - export SENTRY_ORG=myorg
+    - export SENTRY_PROJECT=myproj
+    - export SENTRY_DISABLE_UPDATE_CHECK=true
+    - sentry-cli releases new $CI_PIPELINE_ID
+    - sentry-cli releases files $CI_PIPELINE_ID upload-sourcemaps ./dist
 ```
 
+ # How to make a new version
+
+ Change `ENV VERSION="1.21.0"` in the `Dockerfile` to the new version of sentry-cli. Then make a tag and it will automatically be published to docker hub.
+
+