[kots]: add Gitpod config patch file as advanced option

Original work by @corneliusludmann

Author: Simon Emms

install/kots/manifests/gitpod-config-patch.yaml

@@ -0,0 +1,8 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: gitpod-config-patch
+  labels:
+    app: gitpod
+data:
+  gitpod-config-patch.yaml: '{{repl if and (ConfigOptionEquals "advanced_mode_enabled" "1") (ConfigOptionNotEquals "config_patch" "") }}{{repl ConfigOption "config_patch" }}{{repl else }}{{repl printf "{}" | Base64Encode }}{{repl end }}'

install/kots/manifests/gitpod-installer-job.yaml

@@ -44,12 +44,17 @@ spec:
         - name: installer
           image: 'eu.gcr.io/gitpod-core-dev/build/installer:{{repl ConfigOption "gitpod_version" }}'
           volumeMounts:
+            - mountPath: /config-patch
+              name: config-patch
+              readOnly: true
             - mountPath: /mnt/node0
               name: node-fs0
               readOnly: true
           env:
             - name: CONFIG_FILE
               value: /tmp/gitpod-config.yaml
+            - name: CONFIG_PATCH_FILE
+              value: /config-patch/gitpod-config-patch.yaml
             - name: CONTAINERD_DIR_K3S
               value: /run/k3s/containerd/io.containerd.runtime.v2.task/k8s.io
             - name: CONTAINERD_SOCKET_K3S
@@ -166,11 +171,23 @@ spec:
                 yq e -i '.sshGatewayHostKey.name = "ssh-gateway-host-key"' "${CONFIG_FILE}"
               fi
 
+              echo "Gitpod: Patch Gitpod config"
+              base64 -d "${CONFIG_PATCH_FILE}" > /tmp/patch.yaml
+              config_patch=$(cat /tmp/patch.yaml)
+              echo "Gitpod: ${CONFIG_PATCH_FILE}=${config_patch}"
+              yq eval-all --inplace 'select(fileIndex == 0) * select(fileIndex == 1)' "${CONFIG_FILE}" /tmp/patch.yaml
+
               echo "Gitpod: Generate the Kubernetes objects and apply"
+              config=$(cat "${CONFIG_FILE}")
+              echo "Gitpod: ${CONFIG_FILE}=${config}"
+
               /app/installer render -c "${CONFIG_FILE}" --namespace {{repl Namespace }} | kubectl apply -f -
 
               echo "Gitpod: Installer job finished - goodbye"
       volumes:
+        - name: config-patch
+          configMap:
+            name: gitpod-config-patch
         - name: node-fs0
           hostPath:
             path: /

install/kots/manifests/kots-config.yaml

@@ -337,3 +337,20 @@ spec:
           type: bool
           default: "0"
           help_text: 'Enabling the SSH gateway allows use of additional desktop IDEs. IMPORTANT: This uses port 22 on your Kubernetes nodes. When enabled, this will prevent login to the cluster via SSH. If you wish to maintain SSH access to your cluster, please configure another SSH port on your nodes.'
+
+    - name: advanced
+      title: Advanced customizations (Expert Mode)
+      description: Use with care! Enable only when you know what you are doing!
+      items:
+        - name: advanced_mode_enabled
+          title: Enable advanced mode
+          type: bool
+          default: "0"
+          help_text: Enables advanced customization options. Enable only when you know what you are doing!
+
+        - name: config_patch
+          title: Gitpod config patch (YAML file)
+          type: file
+          required: false
+          when: '{{repl ConfigOptionEquals "advanced_mode_enabled" "1" }}'
+          help_text: A file with Gitpod config that will be used to patch the generated Gitpod config.