Add update-dotnet-install-script workflow

Author: sliekens

.github/workflows/update-dotnet-install-script.yml

@@ -0,0 +1,48 @@
+name: "Update dotnet-install script"
+on:
+  workflow_dispatch:
+  schedule:
+  - cron: '0 0 * * 0'  # Runs every Sunday at midnight UTC (adjust as needed)
+
+jobs:
+  fetch-latest-dotnet-install:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Run fetch-latest-dotnet-install.sh
+        run: src/dotnet/scripts/fetch-latest-dotnet-install.sh
+
+      - name: Create a PR for dotnet-install.sh
+        id: push_image_info
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          set -e
+          echo "Start."
+
+          # Configure git and Push updates
+          git config --global user.email github-actions@github.com
+          git config --global user.name github-actions
+          git config pull.rebase false
+
+          branch=automated-script-update-$GITHUB_RUN_ID
+          git checkout -b $branch
+          message='Automated dotnet-install script update'
+
+          # Add / update and commit
+          git add src/dotnet/scripts/vendor/dotnet-install.sh
+          git commit -m 'Automated dotnet-install script update [skip ci]' || export NO_UPDATES=true
+
+          # Push
+          if [ "$NO_UPDATES" != "true" ] ; then
+              git push origin "$branch"
+              gh api \
+                --method POST \
+                -H "Accept: application/vnd.github+json" \
+                /repos/${GITHUB_REPOSITORY}/pulls \
+                -f title="$message" \
+              -f body="$message" \
+              -f head="$branch" \
+              -f base="$GITHUB_REF_NAME"
+          fi