fix codeowners workflow (#541)

Signed-off-by: Torsten Walter <mail@torstenwalter.de>

.github/workflows/check-codeowners.yaml

@@ -3,11 +3,13 @@ name: Check CODEOWNERS
 on: pull_request
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
+      - name: install yq
+        run: |
+          sudo snap install yq
       - name: generate CODEOWNERS
-        uses: mikefarah/yq@3.4.1
         run: |
           ./scripts/check-codeowners.sh > .github/CODEOWNERS
       - name: check CODEOWNERS for modifications

scripts/check-codeowners.sh

@@ -15,6 +15,6 @@ for DIR in $(ls -1 -d ./charts/*)
 do
   FILE="$DIR/Chart.yaml"
   DIR=$(echo $DIR | sed 's/^\.//')
-  MAINTAINERS=$(yq r $FILE 'maintainers.[*].name'| sed 's/^/@/' | sort --ignore-case)
+  MAINTAINERS=$(yq e '.maintainers.[].name' $FILE| sed 's/^/@/' | sort --ignore-case)
   echo $DIR/ $MAINTAINERS
 done