Update README.md with Docker build and Kubernetes debug instructions

- Added instructions for building and pushing Docker images with specific tags.
- Included steps for creating Kubernetes secrets from local .env files.
- Provided guidance on manually creating and removing a debug pod in Kubernetes.

README.md

@@ -101,6 +101,45 @@ docker build -t ncore-hnr:local .
 docker run --rm --env-file .env -v "$PWD/data:/data" ncore-hnr:local
 ```
 
+Build and push to Docker Hub with a tag in the form `shortgitsha-epoch`:
+
+```bash
+make docker-publish
+```
+
+Build and push the shell-capable debug image:
+
+```bash
+make docker-debug-publish
+```
+
 ## Kubernetes
 
 The `k8s/` folder contains a CronJob, PVC, and example Secret. Store real secrets out of git.
+
+For the Flux deployment, create or update the Kubernetes Secret from your local `.env` without committing the secret values:
+
+```bash
+kubectl -n media-server create secret generic ncore-hnr-secrets \
+  --from-env-file=.env \
+  --dry-run=client -o yaml | kubectl apply -f -
+```
+
+Create a temporary debug pod manually:
+
+```bash
+kubectl apply -f k8s/debug-pod.yaml
+kubectl -n media-server exec -it ncore-hnr-debug -- sh
+```
+
+Inside the pod:
+
+```bash
+ncore-hnr --dry-run=true --notification-dry-run=true --alert-after=0s
+```
+
+Remove the debug pod when finished:
+
+```bash
+kubectl -n media-server delete pod ncore-hnr-debug
+```