NOTES: add FORK.md with release steps

Signed-off-by: Mathew Wicks <[email protected]>

Author: thesuperzapper

FORK.md

@@ -0,0 +1,23 @@
+# Fork Information
+
+## Releasing Steps
+
+1. Take a copy of the upstream `knative-vX.Y.Z` tag and create a new __branch__ on this repo called `fork-X.Y.Z`
+2. Make any change on the `fork-X.Y.Z` branch, prepending the commit message with `FORK: `
+3. Use the GitHub interface to create a tag and release called `vX.Y.Z-deploykf.N`, where `N` is an incremental number starting from `0`
+4. On a local clone of that tag, run the following commands to build and push the images:
+
+```bash
+#
+# WARNING: running this command will immediately push the images to the registry.
+#          update the `--tags` flag, and ensure you have checked out the correct commit
+#
+export KO_DOCKER_REPO="ghcr.io/deploykf/knative-serving"
+ko resolve \
+  --platform "linux/arm64,linux/amd64" \
+  --sbom "none" \
+  --tags "X.Y.Z-deploykf.N" \
+  --base-import-paths \
+  -Rf config/core/ \
+> /dev/null
+```