CI: Add CompatHelper

Author: jpsamaroo

.github/workflows/CompatHelper.yml

@@ -0,0 +1,35 @@
+name: CompatHelper
+
+on:
+  schedule:
+    - cron: '0 0 * * *'
+  workflow_dispatch:
+
+jobs:
+  CompatHelper:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Get Julia compatibility
+        id: julia_compat
+        # NOTE: this requires a Julia compat lower-bound with minor version!
+        run : |
+          version=$(grep '^julia = ' Project.toml | grep -o '".*"' | cut -d '"' -f2)
+          echo "::set-output name=version::$version"
+      - uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ steps.julia_compat.outputs.version }}
+      - name: Install CompatHelper
+        run: |
+          import Pkg
+          name = "CompatHelper"
+          version = "2"
+          Pkg.add(; name, version)
+        shell: julia --color=yes {0}
+      - name: Run CompatHelper
+        run: |
+          using CompatHelper
+          CompatHelper.main()
+        shell: julia --color=yes {0}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}