feat(ci): add Helm chart image update check

.github/workflows/update-check.yml

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+name: Helm chart image tag check
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 */12 * * *"
+
+jobs:
+  check:
+    name: Check
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Download "helm-chart-update-check"
+        uses: engineerd/configurator@v0.0.10
+        with:
+          name: "hcuc"
+          fromGitHubReleases: "true"
+          repo: "pmoscode/helm-chart-update-check"
+          urlTemplate: "https://github.com/pmoscode/helm-chart-update-check/releases/download/{{version}}/hcuc-{{version}}-linux-amd64.tar.gz"
+          version: "v0.1.0"
+          pathInArchive: "hcuc"
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Check for updates
+        run: |
+          hcuc --docker-hub-repo jlesage/jdownloader-2 --fail-on-update --debug
+
+      - name: Send notification
+        if: failure()
+        env:
+          MAILJET_KEY: ${{ secrets.MAILJET_KEY }}
+          MAILJET_SECRET: ${{ secrets.MAILJET_SECRET }}
+          MAILJET_FROM_MAIL: ${{ vars.MAILJET_FROM_MAIL }}
+          MAILJET_TO_MAIL: ${{ vars.MAILJET_TO_MAIL }}
+          MAILJET_SUBJECT: ${{ vars.MAILJET_SUBJECT }}
+        run: |
+          ./pipeline/send_mail.sh

pipeline/mail_data.tpl.json

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+{
+  "Messages":[
+    {
+      "From": {
+        "Email": "$MAILJET_FROM_MAIL"
+      },
+      "To": [
+        {
+          "Email": "$MAILJET_TO_MAIL"
+        }
+      ],
+      "TemplateID": 5363003,
+      "TemplateLanguage": true,
+      "Subject": "$MAILJET_SUBJECT",
+      "Variables": {
+        "project_name": "$GITHUB_REPOSITORY",
+        "project_url": "$GITHUB_SERVER_URL/$GITHUB_REPOSITORY/actions/runs/$GITHUB_RUN_ID"
+      }
+    }
+  ]
+}

pipeline/send_mail.sh

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+#!/usr/bin/env bash
+
+set -e
+
+cat pipeline/mail_data.tpl.json | envsubst > mail_data.json
+
+curl -s \
+  -X POST \
+  --user "$MAILJET_KEY:$MAILJET_SECRET" \
+  https://api.mailjet.com/v3.1/send \
+  -H 'Content-Type: application/json' \
+  -d '@./mail_data.json'
+
+rm mail_data.json