[skip ci] use preinstalled julia for CompatHelper

Author: aminya

.github/workflows/CompatHelper.yml

@@ -1,23 +1,13 @@
 name: CompatHelper
-
 on:
   schedule:
     - cron: '0 1 * * *'
   issues:
     types: [opened, reopened]
-
 jobs:
-  build:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        julia-version: [1.3.1]
-        julia-arch: [x64]
-        os: [ubuntu-latest]
+  CompatHelper:
+    runs-on: ubuntu-latest
     steps:
-      - uses: julia-actions/setup-julia@latest
-        with:
-          version: ${{ matrix.julia-version }}
       - name: Install dependencies
         run: julia -e 'using Pkg; Pkg.add(Pkg.PackageSpec(name = "CompatHelper", url = "https://github.com/bcbi/CompatHelper.jl.git"))'
       - name: CompatHelper.main