♻️ Elasticsearch cert renewal (#60)

# Elasticsearch
Creates `elastic-certs.sh` script to pull renewed SSL certificate from
`traefik` and patch the kubernetes secret in the `elastic` namespace.

## Usage
```sh
# Update elastic cert
./elastic-certs.sh update-elasticsearch
# Update kibana cert
./elastic-certs.sh update-kibana
```

Closes #56

.github/workflows/update.yml

@@ -9,4 +9,4 @@ on:
 jobs:
   update:
     name: 🦿 Update dependencies
-    uses: WGBH-MLA/.github/.github/workflows/update.yml@dependabot/github_actions/dot-github/workflows/peter-evans/create-pull-request-7
+    uses: WGBH-MLA/.github/.github/workflows/update.yml@main

elasticsearch/elastic-certs.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+
+help() {
+    echo
+    echo "Usage: $0 <update-elasticsearch|update-kibana>"
+    echo
+    echo This script gets the latest certificate from Traefik
+    echo and updates the Elasticsearch or Kibana k8s secret
+    echo
+}
+
+get-traefik() {
+    # Get the name of the running Traefik pod
+    TRAEFIK=$(kubectl -n traefik -o json get po | jq -r .items[0].metadata.name)
+
+    if [ -z "$TRAEFIK" ]; then
+        echo "Traefik pod not found"
+        exit 1
+    fi
+    echo "$TRAEFIK"
+}
+
+get-cert() {
+    # Get the certificate object from Traefik that matches the domain
+    DOMAIN=$1
+    CERT=$(kubectl exec -n traefik $TRAEFIK -- cat /ssl-certs/acme-production.json | jq --arg domain $DOMAIN -r '.production.Certificates[] | select( .domain.main==$domain ).certificate')
+
+    if [ -z "$CERT" ]; then
+        echo "Certificate not found for $DOMAIN"
+        exit 1
+    fi
+    echo "$CERT"
+}
+
+update-elasticsearch() {
+    # Update the Elasticsearch secret with the latest certificate
+    TRAEFIK=$(get-traefik)
+    CERT=$(get-cert "elastic.wgbh-mla.org")
+    kubectl -n elastic patch secret elastic-certs -p "{\"data\":{\"tls.crt\":\"$CERT\"}}"
+}
+
+update-kibana() {
+    # Update the Kibana secret with the latest certificate
+    TRAEFIK=$(get-traefik)
+    CERT=$(get-cert "search.wgbh-mla.org")
+    kubectl -n elastic patch secret kibana-certs -p "{\"data\":{\"tls.crt\":\"$CERT\"}}"
+}
+
+"$@" || (help && exit 1)