try docker for helmfile and yq

.github/workflows/diff-values.yml

@@ -1,11 +1,19 @@
 on: push
-
+name: Check values files
 jobs:
   build:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
         uses: actions/checkout@v4
+      - name: Create helmfile docker shim
+        run: >
+          echo 'docker run --rm -v "${PWD}:/wd" ghcr.io/helmfile/helmfile:latest helmfile' > /usr/bin/helmfile
+          chmod a+x /usr/bin/helmfile
+      - name: Create yq docker shim
+        run: >
+          echo 'docker run --rm -v "${PWD}:/wd" --entrypoint yq ghcr.io/linuxserver/yq:latest' > /usr/bin/yq
+          chmod a+x /usr/bin/yq
       - name: Diff generated value files
         run: >
           for env_dir in k8s/argocd/*; do