Deployment: add documenation for Kubernetes

deployment/kubernetes/.gitignore

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+gisaf-*.tgz

deployment/kubernetes/README.md

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+# Kubernetes deployment
+
+This directory contains files for deployment on Kubernetes.
+
+The standard installation uses a namespace named `gisaf`.
+
+Commands below assume that they are run from this directory.
+
+## Plain Kubernetes
+
+2 files: `gisaf.yaml` and `config.yaml`
+
+Deploy on Kubernetes (without Helm)
+
+```sh
+kubectl create namespace gisaf
+kubectl apply -f config.yaml
+```
+
+Update after modification:
+
+```sh
+kubectl --namespace gisaf rollout restart deployment gisaf-server-deployment
+```
+
+## Helm
+
+The `helm` chart is in the directory named `helm`.
+
+### Deploy on Kubernetes
+
+```sh
+kubectl create namespace gisaf
+helm install gisaf helm
+```
+
+#### Update
+
+```sh
+helm upgrade gisaf helm
+```
+
+### Publish the Helm chart
+
+First, build the Helm package:
+
+```sh
+helm package heml
+```
+
+Then upload it:
+
+```sh
+helm --user phil:<password> -X POST \
+--upload-file gisaf-0.1.0.tgz \
+https://code.philo.ydns.eu/api/packages/philorg/helm/api/charts
+```