feat: add kubernetes deployment with kustomize (#258)

Signed-off-by: Guilhem Lettron <guilhem@barpilot.io>

deploy/README.md

@@ -0,0 +1,75 @@
+# kustomize
+
+## Simple
+
+`kustomization.yaml`:
+
+```yaml
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+metadata:
+  name: opengist
+
+resources:
+  - https://github.com/thomiceli/opengist/deploy/
+```
+
+## Full example
+
+`kustomization.yaml`:
+
+```yaml
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+metadata:
+  name: opengist
+
+namespace: opengist
+
+resources:
+  - namespace.yaml
+  - https://github.com/thomiceli/opengist/deploy/?ref:v1.7.1
+
+images:
+  - name: ghcr.io/thomiceli/opengist
+    newTag: 1.7.1
+
+patches:
+  # Add your ingress
+  - path: ingress.yaml
+  - patch: |-
+      - op: add
+        path: /spec/rules/0/host
+        value: opengist.mydomain.com
+    target:
+      group: networking.k8s.io
+      version: v1
+      kind: Ingress
+      name: opengist
+```
+
+`namespace.yaml`:
+
+```yaml
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: opengist
+```
+
+`ingress.yaml`:
+
+```yaml
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: opengist
+  annotations:
+    cert-manager.io/cluster-issuer: letsencrypt-production
+spec:
+  ingressClassName: nginx
+  tls:
+    - hosts:
+        - opengist.mydomain.com
+      secretName: opengist-tls
+```