Rename act_runner to runner (#850)

## Consumer-facing breaking changes

- **Go module path**: `gitea.com/gitea/act_runner` → `gitea.com/gitea/runner`. Anything importing `act/...` or `internal/...` packages (notably Gitea itself) must update imports.
- **Binary name**: `act_runner` → `gitea-runner`. Wrapper scripts, systemd units, init scripts, and documentation referencing the binary by `act_runner` will break.
- **Docker image**: `gitea/act_runner` → `gitea/runner` (incl. `*-dind-rootless` variants). Users pulling `gitea/act_runner:nightly` etc. will get stale images. Note: the image name is `gitea/runner`, not `gitea/gitea-runner`.
- **Release artifact paths**: S3 directory `act_runner/{{.Version}}` → `gitea-runner/{{.Version}}`, and artifact filenames change with the new project name. Existing download URLs break.
- **Metrics namespace**: changed from `act_runner` to `gitea_runner` (e.g. `act_runner_jobs_total` → `gitea_runner_jobs_total`); existing monitors/dashboards must be updated.
- **ldflags version path**: `gitea.com/gitea/act_runner/internal/pkg/ver.version` → `gitea.com/gitea/runner/internal/pkg/ver.version`. Affects anyone building with custom ldflags.
- **Kubernetes example resource names**: `act-runner` / `act-runner-vol` → `runner` / `runner-vol`. Users who copied the manifests verbatim will see resource churn on apply.
- **s6 service name**: `scripts/s6/act_runner/` → `scripts/s6/gitea-runner/` (image-internal; only matters for downstream image overrides).

Unchanged: YAML config field names, env vars (`GITEA_*`), CLI flags/subcommands, registration file format.
---------

Co-authored-by: silverwind <me@silverwind.io>
Reviewed-on: https://gitea.com/gitea/runner/pulls/850
Reviewed-by: Zettat123 <39446+zettat123@noreply.gitea.com>
Reviewed-by: silverwind <2021+silverwind@noreply.gitea.com>
Reviewed-by: Nicolas <bircni@icloud.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-committed-by: Lunny Xiao <xiaolunwen@gmail.com>

examples/kubernetes/README.md

@@ -1,4 +1,4 @@
-## Kubernetes Docker in Docker Deployment with `act_runner`
+## Kubernetes Docker in Docker Deployment with `gitea-runner`
 
 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.
 

examples/kubernetes/dind-docker.yaml

@@ -1,7 +1,7 @@
 kind: PersistentVolumeClaim
 apiVersion: v1
 metadata:
-  name: act-runner-vol
+  name: runner-vol
 spec:
   accessModes:
     - ReadWriteOnce
@@ -13,7 +13,7 @@ spec:
 apiVersion: v1
 data:
   # The registration token can be obtained from the web UI, API or command-line.
-  # You can also set a pre-defined global runner registration token for the Gitea instance via 
+  # You can also set a pre-defined global runner registration token for the Gitea instance via
   # `GITEA_RUNNER_REGISTRATION_TOKEN`/`GITEA_RUNNER_REGISTRATION_TOKEN_FILE` environment variable.
   token: << base64 encoded registration token >>
 kind: Secret
@@ -25,19 +25,19 @@ apiVersion: apps/v1
 kind: Deployment
 metadata:
   labels:
-    app: act-runner
-  name: act-runner
+    app: runner
+  name: runner
 spec:
   replicas: 1
   selector:
     matchLabels:
-      app: act-runner
+      app: runner
   strategy: {}
   template:
     metadata:
       creationTimestamp: null
       labels:
-        app: act-runner
+        app: runner
     spec:
       restartPolicy: Always
       volumes:
@@ -45,10 +45,10 @@ spec:
         emptyDir: {}
       - name: runner-data
         persistentVolumeClaim:
-          claimName: act-runner-vol
+          claimName: runner-vol
       containers:
       - name: runner
-        image: gitea/act_runner:nightly
+        image: gitea/runner:nightly
         command: ["sh", "-c", "while ! nc -z localhost 2376 </dev/null; do echo 'waiting for docker daemon...'; sleep 5; done; /sbin/tini -- run.sh"]
         env:
         - name: DOCKER_HOST

examples/kubernetes/rootless-docker.yaml

@@ -1,7 +1,7 @@
 kind: PersistentVolumeClaim
 apiVersion: v1
 metadata:
-  name: act-runner-vol
+  name: runner-vol
 spec:
   accessModes:
     - ReadWriteOnce
@@ -13,7 +13,7 @@ spec:
 apiVersion: v1
 data:
   # The registration token can be obtained from the web UI, API or command-line.
-  # You can also set a pre-defined global runner registration token for the Gitea instance via 
+  # You can also set a pre-defined global runner registration token for the Gitea instance via
   # `GITEA_RUNNER_REGISTRATION_TOKEN`/`GITEA_RUNNER_REGISTRATION_TOKEN_FILE` environment variable.
   token: << base64 encoded registration token >>
 kind: Secret
@@ -25,32 +25,32 @@ apiVersion: apps/v1
 kind: Deployment
 metadata:
   labels:
-    app: act-runner
-  name: act-runner
+    app: runner
+  name: runner
 spec:
   replicas: 1
   selector:
     matchLabels:
-      app: act-runner
+      app: runner
   strategy: {}
   template:
     metadata:
       creationTimestamp: null
       labels:
-        app: act-runner
+        app: runner
     spec:
       restartPolicy: Always
       volumes:
       - name: runner-data
         persistentVolumeClaim:
-          claimName: act-runner-vol
+          claimName: runner-vol
       securityContext:
         fsGroup: 1000
       containers:
       - name: runner
-        image: gitea/act_runner:nightly-dind-rootless
+        image: gitea/runner:nightly-dind-rootless
         imagePullPolicy: Always
-        # 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"]
+        # command: ["sh", "-c", "while ! nc -z localhost 2376 </dev/null; do echo 'waiting for docker daemon...'; sleep 5; done; /sbin/tini -- run.sh"]
         env:
         - name: DOCKER_HOST
           value: tcp://localhost:2376