use kaniko to build container

.gitlab-ci.yml

@@ -1,18 +1,22 @@
 stages:
   - build
-  - trigger
 
 variables:
-  IMAGE_NAME: thallian/confd-env
-  CI_BUILD_ARCHS: "linux/amd64,linux/arm64"
-  DOWNSTREAM_PROJECTS: " 19 20 21 25 27 28 29 30 31 32 34 35 36 37 39 40 41 42 43 44 47 48 74 88 98 109 112 120"
+  CI_REGISTRY_IMAGE: thallian/confd-env
+  DOWNSTREAM_PROJECTS: ""
 
 build:
   stage: build
+  image:
+    name: gcr.io/kaniko-project/executor:debug
+    entrypoint: [""]
   script:
-    - docker login -u $DOCKER_USER -p $DOCKER_PASSWORD $DOCKER_REGISTRY
-    - docker buildx build --platform "$CI_BUILD_ARCHS" --progress plain --pull --tag "$IMAGE_NAME:$CI_COMMIT_SHA" --tag "$IMAGE_NAME:$CI_COMMIT_REF_NAME" --tag "$IMAGE_NAME:latest" --push .
-    - |
-      for proj in $DOWNSTREAM_PROJECTS; do
-        curl --request POST --form "token=$CI_JOB_TOKEN" --form ref=master $CI_API_V4_URL/projects/$proj/trigger/pipeline
-      done
+    - mkdir -p /kaniko/.docker
+    - echo "{\"auths\":{\"$CI_REGISTRY\":{\"auth\":\"$(printf "%s:%s" "$CI_REGISTRY_USER" "$CI_REGISTRY_PASSWORD" | base64 | tr -d '\n')\"}}}" > /kaniko/.docker/config.json
+    - >-
+      /kaniko/executor
+      --context "$CI_PROJECT_DIR"
+      --dockerfile "$CI_PROJECT_DIR/Dockerfile"
+      --destination "$CI_REGISTRY_IMAGE:$CI_COMMIT_SHA"
+      --destination "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME"
+      --destination "$CI_REGISTRY_IMAGE:latest"

rootfs/bin/confd-env

@@ -0,0 +1,2 @@
+#!/command/with-contenv sh
+confd -onetime -backend env

rootfs/etc/s6-overlay/s6-rc.d/confd/up

@@ -1,2 +1 @@
-#!/command/with-contenv sh
-confd -onetime -backend env
+confd-env