Merge branch '41-missing-curl-or-wget-for-vault-alternative' into 'master'

Resolve "Missing curl or wget for vault alternative"

Closes #41

See merge request to-be-continuous/kubernetes!76

README.md

@@ -491,6 +491,14 @@ Here are its parameters:
 
 This variant allows delegating your secrets management to a [Vault](https://www.vaultproject.io/) server.
 
+#### :warning: Change default `K8S_KUBECTL_IMAGE`
+
+The Vault variant requires `curl` or `wget` to retrieve secrets from the Vault server, which makes it incompatible with the
+[default `K8S_KUBECTL_IMAGE` from Bitnami](https://bitnami.com/stack/kubectl/containers), as `curl` and `wget` are no longer part of it.
+
+As a result, when using the Vault variant, you'll have to select a `K8S_KUBECTL_IMAGE` that - in addition to `kubectl` - contains `curl` or `wget`.
+For instance [container-oc](https://github.com/appuio/container-oc) images (see example below).
+
 #### Configuration
 
 In order to be able to communicate with the Vault server, the variant requires the additional configuration parameters:
@@ -524,6 +532,9 @@ With:
 include:
   # main template
   - component: gitlab.com/to-be-continuous/kubernetes/gitlab-ci-k8s@6.1.0
+    inputs:
+      # ⚠ oc-container image (includes required curl)
+      kubectl-image: registry.hub.docker.com/docker.io/appuio/oc:v4.14
   # Vault variant
   - component: gitlab.com/to-be-continuous/kubernetes/gitlab-ci-k8s-vault@6.1.0
     inputs: