update kubernetes examples to match version 3.0.0 images

Starting with Forgejo runner 3.0.0 images are different in two ways
that matter to k8s because they:

* are all rootless
* do not rely on tini

examples/kubernetes/README.md

@@ -1,13 +1,7 @@
-## Kubernetes Docker in Docker Deployment with `act_runner`
+## Kubernetes Docker in Docker Deployment
 
 Registers Kubernetes pod runners using [offline registration](https://forgejo.org/docs/v1.21/admin/actions/#offline-registration), allowing the scaling of runners as needed.
 
 NOTE: Docker in Docker (dind) requires elevated privileges on Kubernetes. The current way to achieve this is to set the pod `SecurityContext` to `privileged`. Keep in mind that this is a potential security issue that has the potential for a malicious application to break out of the container context.
 
-Files in this directory:
-
-- [`dind-docker.yaml`](dind-docker.yaml)
-  How to create a Deployment and Secret for Kubernetes to act as a runner. The Docker credentials are re-generated each time the pod connects and does not need to be persisted.
-
-- [`rootless-docker.yaml`](rootless-docker.yaml)
-  How to create a rootless Deployment and Secret for Kubernetes to act as a runner. The Docker credentials are re-generated each time the pod connects and does not need to be persisted.
+[`dind-docker.yaml`](dind-docker.yaml) creates a deployment and secret for Kubernetes to act as a runner. The Docker credentials are re-generated each time the pod connects and does not need to be persisted.

examples/kubernetes/dind-docker.yaml

@@ -12,20 +12,20 @@ apiVersion: apps/v1
 kind: Deployment
 metadata:
   labels:
-    app: act-runner
-  name: act-runner
+    app: forgejo-runner
+  name: forgejo-runner
 spec:
   # Two replicas means that if one is busy, the other can pick up jobs.
   replicas: 2
   selector:
     matchLabels:
-      app: act-runner
+      app: forgejo-runner
   strategy: {}
   template:
     metadata:
       creationTimestamp: null
       labels:
-        app: act-runner
+        app: forgejo-runner
     spec:
       restartPolicy: Always
       volumes:
@@ -37,23 +37,23 @@ spec:
       # https://forgejo.org/docs/v1.21/admin/actions/#offline-registration
       initContainers:
       - name: runner-config-generation
-        image: code.forgejo.org/forgejo/runner:2.4.0
-        command: [ "sh", "-c", "cd /data && forgejo-runner create-runner-file --instance $GITEA_INSTANCE_URL --secret $RUNNER_SECRET --connect" ]
+        image: code.forgejo.org/forgejo/runner:3.0.0
+        command: [ "forgejo-runner create-runner-file --instance $FORGEJO_INSTANCE_URL --secret $RUNNER_SECRET --connect" ]
         env:
         - name: RUNNER_SECRET
           valueFrom:
             secretKeyRef:
               name: runner-secret
               key: token
-        - name: GITEA_INSTANCE_URL
+        - name: FORGEJO_INSTANCE_URL
           value: http://gitea-http.gitea.svc.cluster.local:3000
         volumeMounts:
         - name: runner-data
           mountPath: /data
       containers:
       - name: runner
-        image: gitea/act_runner:nightly
-        command: ["sh", "-c", "while ! nc -z localhost 2376 </dev/null; do echo 'waiting for docker daemon...'; sleep 5; done; /sbin/tini -- /opt/act/run.sh"]
+        image: code.forgejo.org/forgejo/runner:3.0.0
+        command: ["sh", "-c", "while ! nc -z localhost 2376 </dev/null; do echo 'waiting for docker daemon...'; sleep 5; done; forgejo-runner daemon"]
         env:
         - name: DOCKER_HOST
           value: tcp://localhost:2376
@@ -61,8 +61,6 @@ spec:
           value: /certs/client
         - name: DOCKER_TLS_VERIFY
           value: "1"
-        - name: GITEA_INSTANCE_URL
-          value: http://gitea-http.gitea.svc.cluster.local:3000
         volumeMounts:
         - name: docker-certs
           mountPath: /certs

examples/kubernetes/rootless-docker.yaml

@@ -1,69 +0,0 @@
-# Secret data.
-# Alternatively, create this with
-# kubectl create secret generic runner-secret --from-literal=token=your_offline_token_here
-apiVersion: v1
-stringData:
-  token: your_offline_secret_here
-kind: Secret
-metadata:
-  name: runner-secret
----
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  labels:
-    app: act-runner
-  name: act-runner
-spec:
-  # Two replicas means that if one is busy, the other can pick up jobs.
-  replicas: 2
-  selector:
-    matchLabels:
-      app: act-runner
-  strategy: {}
-  template:
-    metadata:
-      creationTimestamp: null
-      labels:
-        app: act-runner
-    spec:
-      restartPolicy: Always
-      volumes:
-      - name: runner-data
-        emptyDir: {}
-      # Initialise our configuration file using offline registration
-      # https://forgejo.org/docs/v1.21/admin/actions/#offline-registration
-      initContainers:
-      - name: runner-config-generation
-        image: code.forgejo.org/forgejo/runner:2.4.0
-        command: [ "sh", "-c", "cd /data && forgejo-runner create-runner-file --instance $GITEA_INSTANCE_URL --secret $RUNNER_SECRET --connect" ]
-        env:
-        - name: RUNNER_SECRET
-          valueFrom:
-            secretKeyRef:
-              name: runner-secret
-              key: token
-        - name: GITEA_INSTANCE_URL
-          value: http://gitea-http.gitea.svc.cluster.local:3000
-        volumeMounts:
-        - name: runner-data
-          mountPath: /data
-      containers:
-      - name: runner
-        image: gitea/act_runner:nightly-dind-rootless
-        imagePullPolicy: Always
-        env:
-        - name: DOCKER_HOST
-          value: tcp://localhost:2376
-        - name: DOCKER_CERT_PATH
-          value: /certs/client
-        - name: DOCKER_TLS_VERIFY
-          value: "1"
-        - name: GITEA_INSTANCE_URL
-          value: http://gitea-http.gitea.svc.cluster.local:3000
-        securityContext:
-          privileged: true
-        volumeMounts:
-        - name: runner-data
-          mountPath: /data
-