Add releasing docs (#125)

Author: tsg

apps/dbagent/Releasing.md

@@ -0,0 +1,34 @@
+# Releasing
+
+## Create a new tag
+
+```bash
+git tag -a v0.1.9 -m "Release 0.1.9"
+git push origin v0.1.9
+```
+
+## Create docker image
+
+In the root directory, run something like:
+
+```bash
+docker build --platform linux/amd64  -t xataio/agent:0.1.9 .
+```
+
+Login to docker hub (credentials in 1Password) and push the image.
+
+```bash
+docker push xataio/agent:0.1.9
+```
+
+Update the tag in the `docker-compose.yml` file.
+
+## Release notes
+
+Get the list of changes from the git log since the last tag.
+
+```bash
+git log v0.1.2.. | pbcopy
+```
+
+And summarize it into release notes using AI.