Fix regex in helm_based_job to properly detect gamma tags

helpers/helm_base.yaml

@@ -6,7 +6,7 @@
     - export HELM_EXPERIMENTAL_OCI="1"
     - docker info
     - docker login -u ${CI_REGISTRY_USER} -p ${CI_REGISTRY_PASSWORD} ${CI_REGISTRY}
-    - if [[ $CI_COMMIT_TAG =~ ^gamma-test-[0-9]+_[0-9]+ ]]; then
+    - if [[ $CI_COMMIT_TAG =~ ^gamma-test-r[0-9]+_[0-9]+ ]]; then
         export KUBECONFIG="$GAMMA_GEOSPHERE_TEST_CONFIG";
         kubectl config set-context $(kubectl config current-context) --namespace=${GAMMA_GEOSPHERE_TEST_NAMESPACE};
         kubectl config view --minify;