Update CompatHelper workflow

Author: adrhill

.github/workflows/CompatHelper.yml

@@ -1,44 +1,21 @@
 name: CompatHelper
 on:
   schedule:
-    - cron: 0 0 * * * # Every day at midnight
+    - cron: 0 0 * * 0
   workflow_dispatch:
-permissions:
-  contents: write
-  pull-requests: write
+
 jobs:
   CompatHelper:
     runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+      actions: write
+      contents: read
     steps:
-      - name: Check if Julia is already available in the PATH
-        id: julia_in_path
-        run: which julia
-        continue-on-error: true
-      - name: Install Julia, but only if it is not already available in the PATH
-        uses: julia-actions/setup-julia@v2
-        with:
-          version: '1'
-          arch: ${{ runner.arch }}
-        if: steps.julia_in_path.outcome != 'success'
-      - name: "Add the General registry via Git"
-        run: |
-          import Pkg
-          ENV["JULIA_PKG_SERVER"] = ""
-          Pkg.Registry.add("General")
-        shell: julia --color=yes {0}
-      - name: "Install CompatHelper"
-        run: |
-          import Pkg
-          name = "CompatHelper"
-          uuid = "aa819f21-2bde-4658-8897-bab36330d9b7"
-          version = "3"
-          Pkg.add(; name, uuid, version)
-        shell: julia --color=yes {0}
-      - name: "Run CompatHelper"
-        run: |
-          import CompatHelper
-          CompatHelper.main()
-        shell: julia --color=yes {0}
+      - name: Pkg.add("CompatHelper")
+        run: julia -e 'using Pkg; Pkg.add("CompatHelper")'
+      - name: CompatHelper.main()
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           COMPATHELPER_PRIV: ${{ secrets.DOCUMENTER_KEY }}
+        run: julia -e 'using CompatHelper; CompatHelper.main()'