chore: Complete migration CircleCI -> GitHub Actions (#780)

Signed-off-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

.circleci/config.yml

@@ -1,22 +0,0 @@
-version: 2.1
-jobs:
-  lint:
-    docker:
-      - image: quay.io/helmpack/chart-testing:v3.3.1
-    steps:
-      - checkout
-      - run: ct lint --config .github/configs/ct-lint.yaml --lint-conf .github/configs/lintconf.yaml
-  publish:
-    docker:
-      - image: bash
-    steps:
-      - run: echo "Replaced by Github Workflow - https://github.com/argoproj/argo-helm/actions/workflows/publish.yml"
-
-workflows:
-  version: 2
-  workflow:
-    jobs:
-      - lint
-      - publish:
-          requires:
-            - lint