Add release process document

Signed-off-by: Kate Goldenring <[email protected]>

release-process.md

@@ -0,0 +1,32 @@
+# Cutting a new release of the Spin MQTT trigger plugin
+
+To cut a new release of the MQTT trigger plugin, you will need to do the following:
+
+1. Confirm that [CI is green](https://github.com/spinkube/spin-trigger-mqtt/actions) for the commit selected to be tagged and released.
+
+2. Change the version number in [Cargo.toml](./Cargo.toml) and [spin-pluginify.toml](./spin-pluginify.toml) and run `cargo build --release`.
+
+3. Create a pull request with these changes and merge once approved.
+
+4. Checkout the commit with the version bump from above.
+
+5. Create and push a new tag with a `v` and then the version number.
+
+    As an example, via the `git` CLI:
+
+    ```
+    # Create a GPG-signed and annotated tag
+    git tag -s -m "Spin MQTT Trigger v0.2.0" v0.2.0
+
+    # Push the tag to the remote corresponding to fermyon/spin-trigger-mqtt (here 'origin')
+    git push origin v0.2.0
+    ```
+
+6. Pushing the tag upstream will trigger the [release action](https://github.com/spinkube/spin-trigger-mqtt/actions/workflows/release.yml).
+    - The release build will create the packaged versions of the plugin, the updated plugin manifest and a checksums file
+    - These assets are uploaded to a new GitHub release for the pushed tag
+    - Release notes are auto-generated but edit as needed especially around breaking changes or other notable items
+
+7. Create a PR in the [fermyon/spin-plugins](https://github.com/fermyon/spin-plugins) repository with the [updated manifest](https://github.com/fermyon/spin-plugins/tree/main/manifests/mqtt-trigger).
+
+8. If applicable, create PR(s) or coordinate [documentation](https://github.com/fermyon/developer) needs, e.g. for new features or updated functionality.