update CompatHelper.yml and also run it for subpackages

.github/workflows/CompatHelper.yml

@@ -10,6 +10,16 @@ jobs:
   CompatHelper:
     runs-on: ubuntu-latest
     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@v1
+        with:
+          version: '1'
+          arch: ${{ runner.arch }}
+        if: steps.julia_in_path.outcome != 'success'
       - name: "Add the General registry via Git"
         run: |
           import Pkg
@@ -27,7 +37,7 @@ jobs:
       - name: "Run CompatHelper"
         run: |
           import CompatHelper
-          CompatHelper.main()
+          CompatHelper.main(subdirs=["", "filters/H5Zbitshuffle", "filters/H5Zblosc", "filters/H5Zbzip2", "filters/H5Zlz4", "filters/H5Zzstd"])
         shell: julia --color=yes {0}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}