break: switch from k0s to k3s (in docker)

- replace k0s with k3s in docker-compose.yml
- remove k0s-config.yaml
  - remove metallb-address-pool
- update .renovaterc.json to match new file structure
- add new argocd-init files for k3s
- update README to reflect changes

🤖

argocd-init/000-namespace.yml

@@ -0,0 +1,5 @@
+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: argocd

argocd-init/001-argocd.yml

@@ -0,0 +1,21 @@
+---
+apiVersion: helm.cattle.io/v1
+kind: HelmChart
+metadata:
+  name: argocd
+  namespace: kube-system
+spec:
+  # do not change order! (needed for renovate)
+  chart: argo-cd
+  repo: https://argoproj.github.io/argo-helm
+  version: 7.5.2
+  targetNamespace: argocd
+  valuesContent: |-
+    server:
+      replicas: 1
+    applicationSet:
+      enabled: false
+    notifications:
+      enabled: false
+    dex:
+      enabled: false

argocd-init/002-argocd-apps.yml

@@ -0,0 +1,50 @@
+---
+apiVersion: helm.cattle.io/v1
+kind: HelmChart
+metadata:
+  name: argocd-apps
+  namespace: kube-system
+spec:
+  # do not change order! (needed for renovate)
+  chart: argocd-apps
+  repo: https://argoproj.github.io/argo-helm
+  version: 2.0.0
+  targetNamespace: argocd
+  valuesContent: |-
+    projects:
+      baseline:
+        namespace: argocd
+        finalizers:
+          - resources-finalizer.argocd.argoproj.io
+        sourceRepos:
+          - '*'
+        destinations:
+          - namespace: '*'
+            server: '*'
+        clusterResourceWhitelist:
+          - group: '*'
+            kind: '*'
+    applications:
+      baseline:
+        project: baseline
+        finalizers:
+          - resources-finalizer.argocd.argoproj.io
+        source:
+          repoURL: 'https://git.smsvc.net/k8s/baseline.git'
+          targetRevision: HEAD
+          path: manifests/
+          directory:
+            recurse: true
+        destination:
+          server: 'https://kubernetes.default.svc'
+          namespace: argocd
+        syncPolicy:
+          automated:
+            prune: true
+            selfHeal: true
+          retry:
+            limit: 5
+            backoff:
+              duration: 5s
+              factor: 2
+              maxDuration: 5m