Add automatic update workflow

Author: gharveymn

.github/workflows/update-release.yml

@@ -0,0 +1,58 @@
+name: Check for a new Rust release
+
+on:
+  # Allow for this to be manually run.
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Rust release version'
+        type: string
+        required: true
+
+  # Run at midnight every day.
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  check_for_update:
+    name: Check if there is a new release
+    env:
+      version: ${{inputs.version}}
+    outputs:
+      release_version: ${{ steps.check.outputs.version }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Get the latest release tag name
+        if: env.version == ''
+        run: echo "version=$(gh release view --repo rust-lang/rust --json tagName --jq '.tagName')" >> "$GITHUB_ENV"
+
+      - uses: actions/checkout@v4
+
+      - name: Check if we already have the latest release
+        id: check
+        run: test -f "recipes-devtools/rust/rust-bin-cross_${version}.bb" || echo "version=${version}" >> "$GITHUB_OUTPUT"
+
+  create_pr:
+    name: Create release PR
+    needs: check_for_update
+    if: needs.check_for_update.outputs.release_version
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Generate new files for the release
+        run: ./build-new-version.sh ${{needs.check_for_update.outputs.release_version}}
+
+      - name: Commit new files
+        uses: stefanzweifel/git-auto-commit-action@v5
+        with:
+          branch: feature/rust-${{needs.check_for_update.outputs.release_version}}
+          create_branch: true
+          commit_message: "Rust ${{needs.check_for_update.outputs.release_version}}"
+          add_options: '--all'
+          push_options: '--force'
+
+      - name: Create pull request
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: gh pr create --title "Rust ${{needs.check_for_update.outputs.release_version}}" --body "Automatically generated by update-release.yml"