helm: use git tag as chart version

Special case is when nightly job is running. Because in nighly charts we
want to use nightly Operator image, suffix differentiate it from latest
build.

.github/workflows/go.yaml

@@ -151,7 +151,9 @@ jobs:
     - name: Determine promotion tag for scheduled job
       if: ${{ github.event_name == 'schedule' }}
       run: |
-        echo "IMAGE_TAG=nightly" | tee -a ${GITHUB_ENV}
+        IMAGE_TAG=nightly
+        echo "IMAGE_TAG=${IMAGE_TAG}" | tee -a ${GITHUB_ENV}
+        echo "HELM_CHART_VERSION_SUFFIX=-${IMAGE_TAG}" | tee -a ${GITHUB_ENV}
     - name: Login to DockerHub
       uses: docker/login-action@v1
       with:

Makefile

@@ -45,7 +45,8 @@ HELM_CHARTS ?=scylla-operator scylla-manager scylla
 HELM_CHARTS_DIR ?=helm
 HELM_LOCAL_REPO ?=$(HELM_CHARTS_DIR)/repo/$(HELM_CHANNEL)
 HELM_APP_VERSION ?=$(IMAGE_TAG)
-HELM_CHART_VERSION ?=$(GIT_TAG)-$(HELM_APP_VERSION)
+HELM_CHART_VERSION_SUFFIX ?=
+HELM_CHART_VERSION ?=$(GIT_TAG)$(HELM_CHART_VERSION_SUFFIX)
 HELM_BUCKET ?=gs://scylla-operator-charts/$(HELM_CHANNEL)
 HELM_REPOSITORY ?=https://scylla-operator-charts.storage.googleapis.com/$(HELM_CHANNEL)