MM-20951 Add sentry support to mattermost-server (#14405)

vendor/github.com/getsentry/sentry-go/CONTRIBUTING.md

@@ -0,0 +1,53 @@
+## Community
+
+The public-facing channels for support and development of Sentry SDKs can be found on [Discord](https://discord.gg/Ww9hbqr).
+
+## Testing
+
+```console
+$ go test
+```
+
+### Watch mode
+
+Use: https://github.com/cespare/reflex
+
+```console
+$ reflex -g '*.go' -d "none" -- sh -c 'printf "\n"; go test'
+```
+
+### With data race detection
+
+```console
+$ go test -race
+```
+
+### Coverage
+```console
+$ go test -race -coverprofile=coverage.txt -covermode=atomic && go tool cover -html coverage.txt
+```
+
+## Linting
+
+```console
+$ golangci-lint run
+```
+
+## Release
+
+1. Update `CHANGELOG.md` with new version in `vX.X.X` format title and list of changes.
+
+    The command below can be used to get a list of changes since the last tag, with the format used in `CHANGELOG.md`:
+
+    ```console
+    $ git log --no-merges --format=%s $(git describe --abbrev=0).. | sed 's/^/- /'
+    ```
+
+2. Commit with `misc: vX.X.X changelog` commit message and push to `master`.
+
+3. Let [`craft`](https://github.com/getsentry/craft) do the rest:
+
+    ```console
+    $ craft prepare X.X.X
+    $ craft publish X.X.X
+    ```