Add cert-manager resources

README.md

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+# Netflux on Kubernetes
+
+## Installation
+
+### cert-manager
+
+cert-manager should only be installed in production. It cannot be installed as a subchart.
+
+See: https://cert-manager.io/docs/installation/helm/
+
+```
+helm repo add jetstack https://charts.jetstack.io
+helm repo up
+helm install cert-manager jetstack/cert-manager --namespace cert-manager --create-namespace --version v1.8.0 --set installCRDs=true
+
+# create issuers
+kubectl apply -f cert-manager/issuer-staging.yml
+kubectl apply -f cert-manager/issuer-production.yml
+```
+
+This should be sufficient for cert-manager to issue certificates automatically when the
+`tls.enabled` value is set to `true`.

cert-manager/issuer-production.yml

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+apiVersion: cert-manager.io/v1
+kind: ClusterIssuer
+metadata:
+  name: letsencrypt-production
+spec:
+  acme:
+    server: https://acme-v02.api.letsencrypt.org/directory
+    email: postmaster@netflux.io
+    privateKeySecretRef:
+      name: letsencrypt-production
+    solvers:
+      - http01:
+          ingress:
+            class: nginx

cert-manager/issuer-staging.yml

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+apiVersion: cert-manager.io/v1
+kind: ClusterIssuer
+metadata:
+  name: letsencrypt-staging
+spec:
+  acme:
+    server: https://acme-staging-v02.api.letsencrypt.org/directory
+    email: postmaster@netflux.io
+    privateKeySecretRef:
+      name: letsencrypt-staging
+    solvers:
+      - http01:
+          ingress:
+            class: nginx