From 573b0ce3120eaa466da692ab8664f7ef7ef5a73b Mon Sep 17 00:00:00 2001
From: Eric Lippmann <eric.lippmann@icinga.com>
Date: Thu, 18 Jan 2024 12:46:56 +0100
Subject: [PATCH 1/3] Add Containerfile

---
 Containerfile | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 Containerfile

diff --git a/Containerfile b/Containerfile
new file mode 100644
index 00000000..194ef1dc
--- /dev/null
+++ b/Containerfile
@@ -0,0 +1,14 @@
+FROM golang AS build
+
+WORKDIR /build
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -o /icinga-kubernetes cmd/icinga-kubernetes/main.go
+
+FROM scratch
+
+COPY --from=build /icinga-kubernetes /icinga-kubernetes
+
+CMD ["/icinga-kubernetes"]

From 65fe7ee825ff832cc594fa4ae147a6abc12ddc3e Mon Sep 17 00:00:00 2001
From: Eric Lippmann <eric.lippmann@icinga.com>
Date: Thu, 18 Jan 2024 12:47:15 +0100
Subject: [PATCH 2/3] GitHub: Add workflow for Docker image

---
 .github/workflows/docker-image.yml | 41 ++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 .github/workflows/docker-image.yml

diff --git a/.github/workflows/docker-image.yml b/.github/workflows/docker-image.yml
new file mode 100644
index 00000000..0550dbdc
--- /dev/null
+++ b/.github/workflows/docker-image.yml
@@ -0,0 +1,41 @@
+name: Docker Image
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            icinga/icinga-kubernetes
+          tags: |
+            type=edge
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_PERSONAL_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          file: Containerfile
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

From 5df3e8ada503fa02ce4affcd6b2b7c03b9c89c8c Mon Sep 17 00:00:00 2001
From: Eric Lippmann <eric.lippmann@icinga.com>
Date: Thu, 18 Jan 2024 13:37:07 +0100
Subject: [PATCH 3/3] Add docs how to run the container

---
 doc/02-Installation.md.d/From-Source.md | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/doc/02-Installation.md.d/From-Source.md b/doc/02-Installation.md.d/From-Source.md
index fde5f208..797151c3 100644
--- a/doc/02-Installation.md.d/From-Source.md
+++ b/doc/02-Installation.md.d/From-Source.md
@@ -36,3 +36,14 @@ With locally accessible kubeconfig and `config.yml` files, `icinga-kubernetes` c
 ```bash
 icinga-kubernetes -config /path/to/config.yml [-kubeconfig $HOME/.kube/config]
 ```
+
+## Using a Container
+
+With locally accessible kubeconfig and `config.yml` files,
+run the `icinga/icinga-kubernetes` image using a container runtime of you choice, e.g. Docker:
+
+```bash
+export KUBECONFIG=$HOME/.kube/config
+export ICINGA_KUBERNETES_CONFIG=config.yml
+docker run --rm --network=host -v $ICINGA_KUBERNETES_CONFIG:/config.yml -v $KUBECONFIG:/.kube/config icinga/icinga-kubernetes
+```