Add extra information on how to use this with the gitea runner

README.md

@@ -5,3 +5,66 @@ A cleaned-up fork of https://github.com/JamesJonesConsulting/podman-dind-like th
 This is a dind-like container using podman based on `quay.io/podman/stable` with podman.sock service running. Meant to
 be used with gitea runner as dind replacement to avoid docker --rm race conditions, as `act_runner` does not properly
 wait for docker operations to complete and those are async. Podman does not seem to have that issue
+
+# Kernel pre-requisites
+
+For this to work you need to make sure that you have the following enabled in the kernel
+- CONFIG_NF_TABLES_INET (needs CONFIG_IPv6)
+- CONFIG_NFT_FIB_INET (needs CONFIG_NFT_FIB_IPV4 and CONFIG_NFT_FIB_IPV6)
+
+and your host kernel is a decently new one. So if you are still on the time-proven debian from 2002 with kernel 2.6.* it might be a good idea to upgrade. Tested on 6.18.7. YMMV
+
+# Runner config
+
+That's the config for act_runner
+
+```yaml
+log:
+    level: info
+cache:
+    enabled: true # Optional, needed for action/cache
+    dir: /data/.cache # This has to be mounted into a persistent storage
+container:
+    # That's defaults
+    network: "bridge"
+    require_docker: true
+    docker_timeout: 300s
+    privileged: true # Needed for docker-in-podman-in-docker aka buildkit aka docker buildx
+    options: "--volume=/var/run/docker.sock:/var/run/docker.sock" # for any docker command to work
+    valid_volumes:
+        - /var/run/docker.sock
+```
+
+# DinD config
+
+Using Gitea's Helm chart for the runner https://gitea.com/gitea/helm-actions/
+
+[!NOTE]
+You need the >v0.0.2 release which, at the time of writing this, does not exist. So use the tarball URL as your helm chart directly.
+
+`values.yaml`:
+```yaml
+enabled: true
+statefulset:
+    persistence:
+        size: 1Gi # that's the data-act-runner volume from the config above
+    actRunner:
+        config: <config from the above>
+        extraVolumeMounts:
+            - name: data-act-runner # this is for the cache: true in the config
+              subPath: runner-cache
+              mountPath: /root/.cache
+    dind:
+        repository: <this docker image>
+        tag: latest
+        extraVolumeMounts:
+            - name: data-act-runner # caches the downloaded images and is required for the native overlayfs to work
+              subPath: containers
+              mountPath: /var/lib/containers
+existingSecret: <secret with registration token>
+existingSecretKey: <token key in secret>
+giteaRootURL: <your gitea url>
+```
+
+[!NOTE]
+You either need to mount `/var/lib/containers` as shown or you need `fuse` working. The `fuse` option is not tested