feat(dind): add DIND image

.agola/config.yml

@@ -0,0 +1,48 @@
+version: v0
+runs:
+  - name: Build
+    tasks:
+      - name: Checkout code
+        runtime:
+          type: pod
+          containers:
+            - image: docker.io/alpine/git
+        steps:
+          - clone:
+              recurse_submodules: true
+          - save_to_workspace:
+              contents:
+                - source_dir: .
+                  dest_dir: .
+                  paths:
+                    - '**'
+      - name: Build Docker-in-Docker image
+        runtime:
+          containers:
+            - image: gcr.io/kaniko-project/executor:debug
+        environment:
+          DOCKERAUTH:
+            from_variable: dockerauth            
+        shell: /busybox/sh
+        steps:
+          - restore_workspace:
+              dest_dir: .
+          - run:
+              name: generate docker config
+              command: |
+                cat << EOF > /kaniko/.docker/config.json
+                {
+                  "auths": {
+                    "https://code.icb4dc0.de": { "auth" : "$DOCKERAUTH" }
+                  }
+                }
+                EOF                
+          - run:
+              name: Build and push image
+              command: |
+                /kaniko/executor \
+                  --destination code.icb4dc0.de/prskr/ci-images/dind:latest \
+                  --context dir:///root/project/ \
+                  --dockerfile /root/project/dind/Dockerfile
+        depends:
+          - Checkout code

dind/Dockerfile

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+FROM docker.io/docker:20-dind
+
+ENTRYPOINT [ "/bin/sh" ]