Merge pull request #61 from Icinga/container

Container

.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 }}

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"]

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
+```