add flux-notification-controller Dockerfile

.github/workflows/flux-notification-controller-image.yaml

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+name: Build & push notification-controller image
+on:
+  pull_request:
+  push:
+    paths:
+      - '.github/workflows/flux-notification-controller-image.yaml'
+      - 'dockerfiles/flux-notification-controller.Dockerfile'
+    branches:
+      - main
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    name: Build docker image
+    steps:
+      - uses: actions/checkout@master
+
+      - name: 'Artifact: build && push fluxcd/notification-controller image'
+        uses: aevea/action-kaniko@v0.10.0
+        with:
+          registry: artifact.onwalk.net
+          username: admin
+          password: ${{ secrets.HELM_REPO_PASSWORD }}
+          build_file: dockerfiles/flux-notification-controller.Dockerfile
+          image: k8s/fluxcd/notification-controller
+          tag: v0.24.0
+          cache: true
+          cache_registry: cache

dockerfiles/flux-notification-controller.Dockerfile

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+FROM ghcr.io/fluxcd/notification-controller:v0.24.0 as build
+
+FROM artifact.onwalk.net/k8s/alpine-ca:3.13 as prod
+
+LABEL org.opencontainers.image.source="https://github.com/fluxcd/notification-controller"
+RUN apk add --no-cache ca-certificates tini
+COPY --from=build /usr/local/bin/notification-controller /usr/local/bin/
+USER 65534:65534
+
+ENTRYPOINT [ "/sbin/tini", "--", "notification-controller" ]