Update CompatHelper workflow for Julia setup

Author: andrewrosemberg

.github/workflows/CompatHelper.yml

@@ -10,20 +10,45 @@ permissions:
   pull-requests: write
 
 jobs:
-  compathelper:
+  CompatHelper:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v4
 
-      - uses: julia-actions/setup-julia@v2
+      - 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
+        if: steps.julia_in_path.outcome != 'success'
+        uses: julia-actions/setup-julia@v2
         with:
-          version: '1.9'
+          version: '1'
+          arch: ${{ runner.arch }}
+
+      - 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: julia -e 'using Pkg; Pkg.add("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}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           COMPATHELPER_PRIV: ${{ secrets.DOCUMENTER_KEY }}
-        run: julia -e 'using CompatHelper; CompatHelper.main()'
+          # or: COMPATHELPER_PRIV: ${{ secrets.COMPATHELPER_PRIV }}