External PR notifier GH action

.github/workflows/external_pr_notifier.yml

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+name: External PR notifier
+
+on:
+  schedule:
+    # Every monday at 08:00 UTC
+    - cron: '0 8 * * 1'
+
+jobs:
+  query_prs:
+    name: Report external PRs
+    runs-on: ubuntu-latest
+    permissions: {}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          sparse-checkout: .github/workflows/external_pr_notifier
+      - id: list_prs
+        name: Get a list of external PRs
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          # List non-draft PRs that have 'community' label, excluding bots
+          gh pr list -R uyuni-project/uyuni -l community -s open --json number,title,author,url,isDraft \
+            -q '{"prs": map(select(.isDraft == false and .author.is_bot == false))}' > external_prs.json
+          COUNT=`jq '.prs | length' external_prs.json`
+          echo "::notice::$COUNT PRs with label 'community' found."
+          echo "count=$COUNT" >> "$GITHUB_OUTPUT"
+      - name: Compile email template
+        if: ${{ steps.list_prs.outputs.count > 0 }}
+        uses: cuchi/jinja2-action@v1.2.0
+        with:
+          template: .github/workflows/external_pr_notifier/template.md.j2
+          output_file: template.md
+          data_file: external_prs.json
+      - name: Send weekly summary email
+        if: ${{ steps.list_prs.outputs.count > 0 }}
+        uses: cbbayburt/action-send-mail@v1
+        with:
+          server_address: ${{ secrets.EMAIL_SERVER }}
+          server_port: 587
+          username: ${{ secrets.EMAIL_USERNAME }}
+          password: ${{ secrets.EMAIL_PASSWORD }}
+          subject: "Uyuni Project - Community contributions"
+          to: ${{ secrets.EMAIL_TO }}
+          from: ${{ secrets.EMAIL_FROM }}
+          html_body: file://template.md
+          ignore_cert: true
+          convert_markdown: true

.github/workflows/external_pr_notifier/template.md.j2

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+{#
+  jinja template for Uyuni external contributions weekly notification emails.
+
+  The PR data is available via the 'prs' key in the followng format:
+  prs: [
+    {
+      author: {
+        id,
+        is_bot,
+        login,
+        name
+      },
+      isDraft,
+      number,
+      title,
+      url
+    }
+  ]
+#}
+# Uyuni Project - Community contributions
+
+There are {{ prs|length }} open pull requests from external contributors in [uyuni-project](https://github.com/uyuni-project/uyuni) this week.
+
+{% for pr in prs %}
+ - [#{{ pr.number }}]({{ pr.url }}) - {{ pr.title }} ([{{ pr.author.login }}](https://github.com/{{ pr.author.login }}))
+{%- endfor %}
+
+*Draft pull requests are excluded from the list.*
+
+You can also check out the full list [here](https://github.com/uyuni-project/uyuni/pulls?q=is%3Apr+is%3Aopen+draft%3Afalse+label%3Acommunity).
+
+---
+*This e-mail is auto-generated by the [External PR notifier](https://github.com/cbbayburt/uyuni/actions/workflows/external_pr_notifier.yml) GitHub action.*