CI: test automatic README.md updating

.github/README_TEMPLATE.md

@@ -0,0 +1,19 @@
+<p align="center">
+    <img src="assets/JFrogConanCenter.png" width="600"/>
+</p>
+
+This is a fork of Conan Center Index containing recipes and changes by @valgur not yet merged to the main Conan Center Index.
+
+You can add this repo as a Conan remote with the following commands:
+
+```
+git clone https://github.com/valgur/conan-center-index.git cci-valgur
+conan remote add cci-valgur "$PWD/cci-valgur"
+```
+
+## Added recipes and versions
+
+Here is a list of package versions that are not available on the main CCI as of <date>:
+
+<versions>
+

.github/workflows/daily.yml

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+name: "Update README daily"
+on:
+  push:
+#  schedule:
+#    - cron: "33 3 * * *"
+#  workflow_dispatch:
+jobs:
+  update_readme:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+      - name: Install prereqs
+        run: pip install -U yq
+      - name: Get local package versions
+        shell: bash
+        run: |
+          set -o pipefail
+          cd recipes
+          find * -maxdepth 1 -name config.yml | sort | while read f; do pkg=$(dirname "$f"); yq --raw-output '.versions | "'"$pkg/"'" + keys_unsorted[]' $f | sort; done | tee valgur.list
+      - name: Checkout upstream
+        run: |
+          git remote add upstream https://github.com/conan-io/conan-center-index.git
+          git fetch upstream
+          git checkout upstream/master
+      - name: Get upstream package versions
+        shell: bash
+        run: |
+          set -o pipefail
+          cd recipes
+          find * -maxdepth 1 -name config.yml | sort | while read f; do pkg=$(dirname "$f"); yq --raw-output '.versions | "'"$pkg/"'" + keys_unsorted[]' $f | sort; done | tee conan-io.list
+      - name: Compare package versions
+        run: cd recipes && comm -13 conan-io.list valgur.list | tee diff.list
+      - name: Update README
+        run: |
+          set -o pipefail
+          git checkout dev
+          # Add a '- ' before each item in diff.list
+          sed -i 's/^/- /' recipes/diff.list
+          # Replace <date> with today's date and <versions> with the diff
+          sed "s/<date>/$(date +%Y-%m-%d)/" .github/README_TEMPLATE.md | sed "/<versions>/r recipes/diff.list" | sed "/<versions>/d" | tee README.md
+          git add README.md
+          git diff --staged